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HF Antennas – Model HF-315 Portable HF Magnetic Loop Antenna

Model HF-315 Portable HF Magnetic Loop Antenna
Lightweight, ultra-portable, trail friendly HF antenna which covers 3-15mhz including the 80/75m/60m/40m/30m/20m Amateur Radio bands. Handles 25w PEP SSB, 15w Digital modes. Read further information, feedback, and see video(s) below. Includes free shipping within the USA. Please allow up to 14 business days for domestic delivery.
Available Qty: 2
HF-315cplr Magnetic Loop Antenna Tuner/Coupler
HF-315cplr Replacement Magnetic Loop Antenna Tuner/Coupler. This is the tuner/coupler unit only. Add your own coaxial loop element and stand (if needed) to build a complete antenna. This is a great, low cost way to quickly and easily build your own high-quality Magnetic Loop Antenna - simply supply a 50-ohm coax cable of suitable length (9-10ft.) with PL-259 connectors and build a simple stand (optional) from PVC pipe or ?. Click image for more detail. $7.99 USA Shipping.
Available Qty: 4

** International buyers: For items which offer free USA shipping, that amount will be discounted from the total shipping cost. Please contact before purchase for shipping information and pricing.**

Please Note!

Shipping & delivery time on the HF-315 complete antenna vary depending upon demand and availability but will not be more than 14 business days from the time you order until antenna is delivered to you(USA only). These antennas are labor intense and costly to build and so in order for us to be able to offer them at such low prices it is necessary to build as needed. International delivery times will vary depending upon destination.


(click any image for larger version)


** See video overview below **

The model HF-315 Magnetic Loop Antenna from Caras Mfg. is a rugged, highly portable antenna system which has been designed for rapid deployment, ease of use, and good performance. This is a very compact antenna which can easily fit into a backpack and requires no counterpoise wires, ground radials or external antenna tuner.

These characteristics make this antenna ideal for most any application where a small, yet high performance HF antenna is needed – i.e. apartments, hotels/motels, temporary demonstrations, camping/hiking, and any other space constricted area.

Transmit & receive frequency coverage is continuous from 3 to 15 Mhz, allowing coverage of the 80 thru 20m ham bands along with MARS/CAP frequencies and several of the most popular SWL bands.

Magnetic loop antennas such as this are noted for high 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, Icom IC-703, and other portable radios such as HF military manpack radios etc.

These antennas are made from quality parts and materials – i.e. all metal variable capacitor, high quality low-loss internal wiring. Loop cables are made with high quality Amphenol® PL-259 connectors and good quality coaxial cable. The included stand is made from thick-wall schedule 40 PVC pipe.

Main Features:

  • Ultra portable. Can be easily stored inside a small case, bag, backpack, etc.
  • Very lightweight. 1.5lbs.(0.7kg.) without included PVC stand, 3lbs.(1.36kg) with stand.
  • A great HF antenna solution for Hiking, SOTA, EMCOMM, etc.
  • Built-in standard 1/4 x 20 tripod mount for use with photo tripods if needed.
  • Quick-connect BNC 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 mhz to 15 mhz, including the 80/75m, 60m, 40m, 30m, and 20m Amateur Radio bands.
  • Design provides good performance at all covered frequencies.
  • Rated transmit power of 25 watts P.E.P. SSB/CW, 10 watts continuous carrier.
  • High signal transfer efficiency is maintained throughout the usable bandwidth.
  • 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.

Each antenna comes complete with Coaxial Loop Element, Coupler Unit, PVC stand with tripod mount, and printed user guide.

Here is an overview video:


Some feedback on the HF-315 portable loop antenna:


Feedback from our eBay customers:

“Very Very Cool Mag Loop =)”

“+++ quick and easy, best seller, thanks +++”

“Very good antenna”

“Item as described”

“Great company fast delivery and a great antenna works better than I had hoped!”

“Very nice antenna. Thank you!”

“Excellent product. I love this loop. Tuning it is a chore for tx. :)”

“Holy crap! Fantastic delivery, great product. All hams should have one!”

“This is a really great working antenna. Thank you for a fantastic antenna!!!!!!”

“Good little loop antenna. Great service.”

“Built better than I hoped. Great loop antenna, perfect for portable qrp…”

“Excellent Excellent quality! Product exceeded expectation. Thank you!“

“Great product, works really well. I’m very pleased & would recommend. Thanks!”

“Super good service. Antenna works well on all bands – even inside the house!”

“VERY nice loop!! Very happy with performance. A1++. Thanks!



Other feedback:

I assembled the loop this evening and have been doing some quick basic shortwave listening with a cheap Grundig YB400. Absolutely pleased! Huge improvement verses the whip antenna. I’ll try QRP this weekend with my HF rig. I really think you have a winner here that can’t be beat for the money!”

– Steve, Joplin, MO

“I received the antenna over the weekend and finally got to try it this morning. I was in the house, did not have a tripod, so was holding the loop up in the air in one hand, and the mic in the other. Looked pretty funny. Made several contacts on 40m with 5-5 signal reports at 15 watts. I was very pleased. I had looked at a lot of loops online that were around $400. Thanks for having such a great product at such a great price!”

– Mike, Jacksonville, FL

“I received the antenna by usps priority mail. Manufacture quality is superb. Performance excited me enough to order an ft-891! PSK reported me getting out, conditions on hf were blackout quality but I was heard on jt65 20m all over NA. You can’t go wrong with this loop, highly recommended. kk4rdi. I plan on using the loop on the beach after kayaking to my favorite coastal spots.”
-Jerry, Jacksonville, FL

“GREAT value.. money vs what you get= Awesome!. The HF-315 seems to produce much better nulling/directionality then the other 2 loops which I had bought before. Wish I’d discovered your loop before the other two, I probably never would’ve bought them.”
– Paul, Warren, PA

Just wanted to let you know that the package with antenna arrived yesterday safely, thank you for great packaging job!
Antenna works miracles, I have never had such a quiet and efficient indoor antenna. I am really thrilled with this loop! Thank you very much again.”
– Ed, Philadelphia, PA

Loop arrived and shipping was fast. All assembled easily. I have made some contacts on 20 meters. Seems to work well on 80, 40 and 20 meters. I am happy with it as all my contacts are with the antenna, inside set up in front of a window. Farthest contact was about 600 miles. Tuning is touchy but SWR is good. Thanks for a reasonably priced mag loop that has good quality and operates as it should.
– Fred, Bartonville, IL

Everything arrived on schedule and went together perfectly. Tested at home on 817ND (5 Watts) and set up at Field Day. We are members of ARES and LAECT (Los Angeles Emergency Communications Team) and our Field Day is devoted to Emergency Communications. We have CERT/Hospital and Public Service Groups in for training, hold a License Exam and demonstrate different Go-Bags, Hospital Comms Support, Comms Vehicles etc.
Without exaggeration I can say your portable loop was the hit of the show. We did digital (Furthest PSK31 QSO was Florida on 20M, NBEMS on MT63-1L on 40M mostly within about 200 miles. Also did some WINMORE on 20/40M, made contact all the way to Austin TX. Did SSB on 14.300 Maritime Net up to British Vancouver and down to Cancun, Mexico. FYI, for tuning we use noise than fine tune to a YOUKITS Antenna Analyzer which is connected to a two-position coax switch. When we get where we need to be, just switch over to the rig.
Thanks for getting us in the first Group for a Unit,. I am sure you will be hearing from some of our folks, because your loop rounds out our Standard GoKit perfectly!”
– Mike, Pasadena, CA.


Here are some recent WSPRLite results from this antenna from a station in Gaithersburg, MD. Jim was using a WSPRLite unit running 200mw (Thats 2/10 of 1 watt!), with the antenna located in his living room, first on 20m and then later on 40m. In Jim’s words:

“It Works!! 20m WSPRlite running 200mW of TX power.
Poor band conditions. HF-315 loop in my living room!

On 20m:


And again on 40m:

“I have been running it on 40m today and it’s doing well, even under abysmal band conditions. Still 200mW indoors.
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