[Elecraft] Urban stealth HF: Inside-the-backpack loop antenna?

[Clay Autery]

Consider integrating the loop into a purpose built/modified backpack...  or the frame.
You can get a larger enclosed area, maintain easier use of the pack's volume without jacking up the loop, and better insure the loop geometry doesn't change as you pack/move/use it.
With a little creativity, yiu could also integrate some variable tuning into the design with access by hand if you place the adjusrable parts in the right location...
If you do switch in/out parts, it could be just a switch setup on the torso strap...
If QRP, I'd try to use the frame or an extension thereof...
Even the flexible plastic stiffeners in some frames could be used to carry a loop wire.
Good luck!
73,
ClayKY5G


Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Wayne Burdick <n6kr at elecraft.com> Date: 1/22/19  14:57  (GMT-06:00) To: Elecraft <elecraft at mailman.qth.net> Cc: KX3 <KX3 at yahoogroups.com> Subject: [Elecraft] Urban stealth HF: Inside-the-backpack loop antenna? 
I’ve engaged in plenty of ultralight HF pack operation, with a KX2, AX1 antenna and a dragged counterpoise. In wide open spaces it’s a blast. But urban settings with dogs, wire-eating cacti and overzealous Neighborhood Watchers can distract from one’s radio experience. 

So, just for grins, I’d like to try something completely incognerdo: no visible antenna. A small remotely tuned loop (say 12” diameter) would seem to be the best choice, as it would fit entirely inside a small backpack. It could have  modest efficiency while not requiring a counterpoise wire. Rigid 1” copper pipe formed in a square would be convenient to deploy. 

The loop would be only 6 to 8” from soft tissue, so you’d want to run QRP, of course.  OTOH, we’re talking about HF. A cellphone by your ear is probably worse. 

Any other antenna suggestions?

Wayne
N6KR



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