SignaLoop™ Portable HF Magnetic Loop Antenna

*Please note: depending upon availability of certain parts, tuning unit appearance may be slightly different than that shown. Quality, specifications and performance will remain the same.

Please read the FAQ section further down this page, and feel free to contact any time if you have any questions.

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Since its introduction in late 2015, the HF-319 has become a popular antenna and is used in a variety of situations. It is also the lowest cost high quality complete small magnetic loop antenna currently available. These antennas are made from high quality parts and materials – i.e. all metal rugged variable capacitor, not plastic Polycon which is easily destroyed. High quality low-loss internal wiring. Loop cables are made with high quality connectors and good quality 100% coverage semi-rigid coaxial cable. The included antenna support is made from thick-wall schedule 40 PVC pipe. Manufactured & tested in the USA.

Each antenna is quality checked and then tested using a spectrum analyzer, tracking generator, and return loss bridge followed by actual on-air tests with a ham transceiver before shipping. Each antenna comes complete with Coaxial Loop Element, Tuning Unit, Antenna Support with integrated 3/8×24 standard tripod mount, and 7 page printed user manual.

Main Features:

Ultra portable. Can be easily stored inside a small case, bag, backpack, etc. and quickly deployed.
Very lightweight. 1.5lbs.(0.7kg.) without included PVC stand, 3lbs.(1.36kg) with stand.
A great HF antenna solution for Hiking, SOTA, EMCOMM, Demonstrations, etc.
Built-in standard 1/4×20 tripod mount for use with photo tripods if needed.
Common SO239 connection to radio.
No separate coupling loop needed. Tuning and coupling components are housed within a single enclosure.
Very quick and easy to tune as needed. Simply tune for maximum noise on receive and then apply transmit power & fine tune (if needed) for lowest SWR.
Transmit/Receive frequency coverage is continuous from 3 to 19 mhz, including the 80/75m, 60m, 40m, 30m, 20m and 17m Amateur Radio bands and many MARS & SWL frequencies.
Design provides good performance at all covered frequencies.
Rated transmit power of 20 watts* P.E.P. SSB/CW, 10 watts* continuous carrier. (*For 80/75m – 15w PEP/10w Continuous)
Does not require any type of counterpoise, ground radials, nor ground connection for operation.
Does not require an antenna tuner. Tuner is built-in.
Inherent low-noise, high signal ratio.
Hi-Q design helps to reject off-channel interference.
Directional & magnetic signal response properties of the antenna allow for high rejection of local noise sources along with maximum reception of the desired signal.

Magnetic loop antennas such as this are noted for good efficiency compared to portability, along with low noise, and an ability to reduce or often eliminate many types of receive interference due to high directivity and deep, sharp nulls in the perpendicular plane.

This antenna is perfect for use with any receiver and/or low-powered transceiver such as the Yaesu FT-817, Elecraft KX3, KX2, Icom IC-705, Xiegu HF portables and other portable radios such as HF military manpack radios etc.

FAQ regarding this antenna:

Q: There are several small magnetic loop antennas on the market now, but most are much more expensive than this one. How come?

A: Glad you asked. Yes there are several small loop antennas being made these days and they are all very good quality & useful products. Our SignaLoop HF-319 is no exception, and the reason that it is inexpensive compared to others in its class is simple – our overhead is low and we recycle shipping boxes, packing material etc. whenever possible. Further, our antenna stand is made from simple schedule 40 thick-wall PVC pipe because furniture grade PVC is much more expensive and not at all necessary for this. We are passing these savings along to you. Also, we are most certainly not making large, and usually not even modest amounts of money at this. Instead, we are building a nice quality and usable product while we help a little bit to support ourselves and to contribute to the world, national, and local economies.

Q: So I ordered my SignaLoop antenna on xx/xx/xx and it hasn’t arrived yet. Why does it take up to 14 business days?

A: This is another way in which we save you money and yet produce a high quality product. These antennas are labor intense and costly to build and so in order for us to be able to offer them at such a low price it is necessary to build as needed. In particular, the variable capacitors which are used in these antennas (quality metal, not the lesser poly plastic types which can be easily ruined) are quite expensive and therefore are generally ordered as needed with only a few kept on hand at any given time.

Q: I’ve seen lots of small magnetic loop antennas, and they all use a smaller loop for coupling to the radio. Where is it?

A: The SignaLoop HF-319 antenna does not use a separate smaller coupling loop in its feed system. During design & testing in 2015, a design goal of this antenna was to contain all coupling & tuning components within the tuning box. Doing this offers a few convenience advantages such as allowing the antenna to be used without the antenna stand if needed so that a hiker or backpacker can carry & deploy it easily and simply hang it from perhaps a couple of low tree branches or ?. Also, exterior coupling loops can be fussy for tuning with regard to alignment and distance from the main radiating loop. Our design eliminates that problem.

Q: Will this antenna make my receiver hear everything, get me awesome transmit signal reports each and every time that I use it, and make coffee too?

A: Honestly, no. But don’t fret – the skill of making coffee is something to be proud of, and the loop antenna will give you a usable signal under most circumstances. The king thing with these antennas is in the performance-to-size ratio and their ability to operate efficiently without the need for ground wires, radials, or any other type of counterpoise. Also, they are a highly directional antenna and are therefore able to help combat (and quite often eliminate entirely) many sources of radio interference on receive as well as to concentrate the transmit signal in a given direction, much like a good yagi beam antenna. Further, once tuned to a given frequency, the small loop antenna will tend to act as a passband filter due to its narrowband nature and will therefore help to reject strong out-of-band signals and even some in-band ones. But, as always, there is a tradeoff – this is not a broadband antenna and so must be retuned each time you change frequencies by any significant amount. If your interest is for receive only, the SignaLoop HF-319 can do very well at this and there are also several good-quality broadband active receive-only loop antennas on the market.

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