I saw somebody else mention a speaker wire antenna. I used the concept from the 22nd Edition of the ARRL Antenna book and made mine cut resonate for 20m suing 22 gauge speaker wire. I make YouTube videos of my SOTA activations and I’ve been testing this unit out on my 817 for the last 5 summits with excellent results. My KX2 actually arrives tomorrow, but back to the antenna… I purposefully made a resonant antenna for 20m since that is the most versatile band while activating in my experience. I have worked from CA to FL, NJ and all across the US. I set it up as an inverted V type configuration and instead of the “NorCal Doublett” style I use just regular old speaker wire and cut a total length to include about 18-20’ above ground then I used 486/freq to start my legs. That purposefully gave me some room to wiggle since this calls for an “electricians knot” at the split to prevent it from opening up further causing issues. I then trimmed the antenna down and added insulators on the ends made of zip ties that have holes in them cut to account for threading the end of the wire and string to tie off the ends with whatever terrain I have. Again, go check out my YouTube channel for more on it’s performance but with 5 watts its doing a great job. I do orient it with the legs running NS so it’s broadside is EW facing and sometimes point the broadside a little NE/SW depending on where I’m trying to reach. By next week I should have the special section of the video I recorded on Monday’s activation edited to give you a visual and if you need any other info please let me know and I’d be happy to send my measurements and specific materials your way for consideration. My goal is ultra lightweight; hence why I promptly sold that Buddipole I bought too and have been shrinking my kit down as much as possible. My total pack weight with 3 liters of water, my entire radio kit, double lunch, snivel gear (cold weather stuff) and DJI Mavic drone with 3 batteries and controllers is sub 23 pounds! Hope this helps!
73 - KG6HQD - Jerry
PS - I do have on hand a LNR Trail Friendly 40/20/10 with 15 that’s tiny but the coax needed and antenna outweighs my entire 20m antenna described above but it worked pretty good and is small.