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We have the high performance low frequency antenna that you've been looking for!
Specialty antennas for geological research and low frequency communications.
New antennas are on the way! We continue to support the low frequency bands below 530 KHz with new antennas. New 12 inch long and 36 inch long antennas with increased performance! Pre-order today!
Antennas feature solid core 2nd generation ferrite rods for excellent reception performance.
New antennas will be available 3 weeks after 06-25-2010. See models below on this page!
These will replace previous models. Check your frequency range and cross-reference the new model below.
All new antennas come standard with an SO-239 "CB" type jack. You can convert this jack to nearly anything (RCA, BNC, etc) with standard screw-in adapters that are available (from Radio Shack stores).
All new receiving antennas come standard with internal 90-volt surge limiter (unless otherwise noted). This limits the voltage across the antenna to 90 volts. Transmitting antennas (that generate high RF voltage) do not include this feature.
These tuned antennas work by greatly magnifying the radio signal's magnetic field. A receiver placed near the antenna in the magnified field will have a very great boost in signal reception. Powered only by the received signals, no batteries or any extra power needed. These antennas are great for portable directional reception applications.
New to Low Frequency Radio? You do not need to mount these antennas high up on a pole or roof! They receive the powerful magnetic field component of the radio signals. They will do an excellent job just 3 feet above ground. You can even bury the antenna underground and it will still work, and can pull earth-conducted signals out of the earth. You can drop them down a test well hole to receive underground ULF, VLF. LF signals, etc.
These antennas offer a high impedance output suitable for feeding equipment with high impedance inputs. Will match perfectly a FET pre-amplifier.
You can also perfectly match a 50 ohm or 75 ohm antenna input by winding a few turns (about 2 to 20) of wire on the outer case.
Need to receive just one station well? You can permanently tune the antenna to the desired station by placing a fixed value capacitor across the terminals, then run a coaxial cable back from 2 to 20 turns (produces a 50-ohm match) looped around the antenna's case. These antennas do not require any ground-plane or artificial counterpoise like an electric field whip antenna.
We offer several models of tuned antennas that allow you to peak up the desired weak signals in various bands below 530 KHz. The antennas can be rotated to cut interference because they are directional.
These antennas are weather-sealed and tough and ready to be installed into your custom radio equipment or are useful in sensor modules.
Though the antennas are weather proof and water proof it is suggested that due to exposed binding posts that the unit be mounted in a PVC enclosure to keep rain off the binding posts.
No batteries or power source is needed for the antennas, they just pull the signals out of the air.
These antennas do NOT need to be mounted high on your roof! They pick up the magnetic field portion of the radio wave which is strong near ground level (at frequencies below 1 MHz). Just mount the antenna 3 to 6 feet above ground and you will have great reception. MOST USERS WILL USE THE ANTENNA INDOORS, NO NEED TO MOUNT IT OUTDOORS. LF waves pass easily through most home building materials.
Low frequency radio waves will easily penetrate home building materials so the antenna will work indoors in most cases.
See more about individual antennas below on this page.
Sales to USA and Canada only.
This page is under construction - New antennas to arrive 3 weeks after 06-25-2010. Pre-order today!
NOTE! We are still awaiting the new antennas. The ferrite rods for the antennas are being pressed and fired. This should be completed in about 3 weeks from 06-25-2010. These new antennas to replace our previous lines. Feel free to browse items below.
Long wave Antennas for 30 KHz to 530 KHz.
These antennas feature a long ferrite rod for solid reception performance. Directional to zero-in on desired stations.
A12T is 15 inches long. A22T is 24 inches long (shown above).
| Part # | Radio Band | Low Freq | Hi Freq | __Price |
|---|---|---|---|---|
| A12T-150K-530K-SO239 | Longwave - Beacons | 150 KHz | 530 KHz | $ 85.00 |
| A22T-150K-530K-SO239 | Longwave - Beacons | 150 KHz | 530 KHz | $ 135.00 |
| A12T-50K-170K-SO239 | LF - LORAN - WWVB | 50 KHz | 170 KHz | $ 85.00 |
| A12T-30K-110K-SO239 | LF - WWVB | 30 KHz | 110 KHz | $ 85.00 |
| A12T-26K-90K-SO239 | LF - WWVB | 26 KHz | 90 KHz | $ 85.00 |
Do you have a portable radio that tunes the "LW" band or "Longwave" band (150 KHz - 530 KHz) but you don't hear any stations? This band is full of low power (10 watts to 100 watts) airport navigation beacons that send location ID's as morse code. A few voice weather broadcasts and even one-way emergency ground-to-air transmissions on very rare occasion can be heard.
With these antennas you will finally be able to hear these low powered beacon stations clearly!
Many portable radios just have a small 4-inch ferrite rod for LW reception. This MONSTER long ferrite antenna will supercharge your LW listening pleasure!
Just lay your radio near the center of the antenna and use a variable capacitor to tune the antenna to desired station. A great boost in reception will occur without needing to connect any cables to the radio. Make your antique AM / LW pocket portable radio perform like new!
For other reception applications the antennas offer very high impedance output that will feed a FET pre-amplifier, or you can wind a few turns around the case of the antenna to provide a 50 ohm match which offers very high "Q". Signals can be fed down a long length of 50 ohm coaxial cable.
Antennas with "A" prefix in part numbers: Tune this antenna with a variable capacitor range of 0 to 932 pF. @ 932 pF tunes to "Low Freq" bottom of indicated band.
This antenna MUST be tuned to the desired station. Antenna has a narrow bandwidth to help cut adjacent channel interference so you must retune the antenna when changing stations. Antenna can be fix-tuned to a single favorite station with a fixed-value capacitor in the range of 100 pF to 932 pF. You will have to experiment to find the value needed for your favorite station. Just parallel individual capacitors across the binding posts until maximum signal strength is obtained. (Radio Shack has a grab-bag of about 100 quantity of "pF" range 'ceramic disc' capacitors for under $ 5.00). Great for permanently tuning in WWVB 60 KHz or other single LF station of interest.
Great boost in signal strength results when antenna is properly tuned to desired station.
NOTE: These antennas have a built-in surge limiter (90 volts) to prevent possible arcing across terminals or damage to antenna connector.
Sales to USA and Canada only.
This page is under construction - New antennas to arrive 3 weeks after 06-25-2010. Pre-order today!
VLF antennas for 3 KHz to 30 KHz.
22T is 24 inches long (shown above). 12T is 15 inches long. 36T is 39 inches long.
Click underlined part numbers for data and response chart.
| Part # | Radio Band | Low Freq | Hi Freq | __Price |
|---|---|---|---|---|
| A12T-10K-45K-SO239 | VLF-LF | 10 KHz | 45 KHz | $ 85.00 |
| A22T-20K-40K-SO239 | VLF-Hi | 20 KHz | 40 KHz | $ 135.00 |
| A22T-10K-30K-SO239 | VLF-Hi | 10 KHz | 30 KHz | $ 135.00 |
| A22T-5K-10K-SO239 | VLF-Mid | 5 KHz | 10 KHz | $ 135.00 |
| A22T-3K-5K-SO239 | VLF-Lo | 3 KHz | 5 KHz | $ 135.00 |
| N12T-2K-10K-SO239 | VLF-Lo | 2 KHz wideband | 10 KHz wideband | $ 90.00 |
| N22T-2K-10K-SO239 | VLF-Lo | 2 KHz wideband | 10 KHz wideband | $ 140.00 |
| N36T-2K-10K-SO239 | VLF-Lo | 2 KHz wideband | 10 KHz wideband | $ 199.00 |
"A" prefix: Tune this antenna with a variable capacitor range of 0 to 932 pF. @ 932 pF tunes to "Low Freq" bottom of indicated band. Antennas will tune slightly lower when used with our 1398 pF capacitor.
"N" prefix: These antennas are wide band for listening to natural VLF radio waves. Tweeks, Whistlers, Aurora noise, Dawn Chourus, etc.
NOTE: These antennas (exept for some "N" types where it is not needed) have a built-in surge limiter (90 volts) to prevent possible arcing across terminals or damage to antenna connector.
NOTE: N12T-2K-10K-SO239 and N22T-2K-10K-SO239 and N36T-2K-10K-SO239 are wideband antennas (not tunable) for listening to natural radio waves in the range of 2 KHz to 10 KHz. Tweeks, Whistlers, Aurora noise, Dawn Chourus, etc. Output impedance is 5000 ohms. A nearly perfect match to most audio amplifier's microphone inputs.
This page is under construction - New antennas to arrive 3-weeks after 06-25-2010. Pre-order today!
ULF antennas for 300 Hz to 3 KHz.
AF22T is 24 inches long (shown above). AF12T is 15 inches long.
Antennas in this range are useful for research and specialized remote sensing applications.
Click underlined part numbers for data and response chart.
| Part # | Radio Band | Low Freq | Hi Freq | __Price |
|---|---|---|---|---|
| AF12T-800H-3K-SO239 | ULF | 800 Hz | 3000 Hz | $ 125.00 |
| AF22T-300H-1K-SO239 | ULF | 300 Hz | 1000 Hz | $ 175.00 |
For experimental and research applications.
"AF" prefix antennas are tunable over a wide range with an external fixed value capacitor.
A capacitor value of 1000 pF tunes -800H-3K-SO239 to 3 KHz upper limit.
A capacitor value of 47000 pF tunes -800H-3K-SO239 to 800 Hz lower limit.
A capacitor value of 10000 pF tunes -300H-1K-SO239 to 1 KHz upper limit.
A capacitor value of _____ pF tunes -300H-1K-SO239 to 300 Hz lower limit.
NOTE: These antennas have a built-in surge limiter (90 volts) to prevent possible arcing across terminals or damage to antenna connector.
NOTE:
These antennas have output impedances over 100,000 ohms at resonance peak.
This page is under construction - New antennas to arrive 3weeks after 06-25-2010. Pre-order today!
SLF antennas for 30 Hz to 300 Hz.
AF36 is 39 inches long.
Antennas in this range are useful for research and specialized remote sensing applications.
| Part # | Radio Band | Low Freq | Hi Freq | __Price |
|---|---|---|---|---|
| AF36T-30H-300H-SO239-NEW | SLF | 30 Hz | 300 Hz | $ 300.00 |
For experimental and research applications.
These antennas have output impedances over 100,000 ohms.
"AF" prefix antennas are tunable over a wide range with an external fixed value capacitor.
A capacitor value of _(@ 10000) _pF tunes AF36T-30H-300H-SO239 to 300 Hz upper limit.
A capacitor value of ______ pF tunes AF36T-30H-300H-SO239 to 30 Hz lower limit.
NOTE: These antennas have a built-in surge limiter (90 volts) to prevent possible arcing across terminals or damage to antenna connector.
This page is under construction - New AM antennas to arrive after 08-25-2010. Pre-order today!
AM antennas for 530 KHz to 1700 KHz.
These antennas feature a long ferrite rod for solid reception performance. Directional to zero-in on desired stations.
A12L is 15 inches long. A22L is 24 inches long.
| Part # | Radio Band | Low Freq | Hi Freq | __Price |
|---|---|---|---|---|
| B12L-530K-1700K-SO239 | AM Broadcast | 530 KHz | 1700 KHz | $ 95.00 |
| B22L-530K-1700K-SO239 | AM Broadcast | 530 KHz | 1700 KHz | $ 150.00 |
Many portable radios just have a small 4-inch ferrite rod for AM reception. These MONSTER sized long ferrite antennas will supercharge your AM listening pleasure!
Just lay your radio near the center of this antenna and use a variable capacitor to tune the antenna to desired station. A great boost in reception will occur without needing to connect any cables to the radio. Make your antique AM pocket portable radio perform like new!
Antennas with "B" prefix in part numbers: Tune this antenna with a variable capacitor range of 0 to 384 pF. @ 384 pF tunes to "Low Freq" bottom of indicated band in table above.
This antenna MUST be tuned to the desired station. Antenna has a narrow bandwidth to help cut adjacent channel interference so you must retune the antenna when changing stations. Antenna can be fix-tuned to a single favorite station with a fixed-value capacitor in the range of 50 pF to 390 pF. You will have to experiment to find the value needed for your favorite station.
Great boost in signal strength results when antenna is properly tuned to desired station.
Sales to USA and Canada only.
Antennas are also available with binding post connections. Instead of "SO239" suffix on part number, change to "BP" for binding posts.
Example:
"A22T-10K-30K-BP" for a unit with red and black binding posts like in photo above.
"A22T-10K-30K-SO239" for a unit with an SO239 connector.