r/AntennaDesign

▲ 3 r/AntennaDesign+1 crossposts

Using loading coils to shorten radials?

I currently have a DIY pota performer antenna, but I wanted to see if I could shorten the radials of it so that the entire antenna could fit in the my truck bed (sometimes I want to do some hunting during lunches at work, and I want to keep it confined). I currently have the whip on a standard photographer tripod, but was wondering if I could use/if anyone had experience with using loading coils to shorten the rather long radials. I would only be doing 20M with this antenna so it wouldn't have to be multiband.

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u/ragnot-dev — 6 days ago

yo who else is still rocking weird diy antennas in 2026??

just sitting here watching free local channels and laughing at how much money people drop on fancy setups. i threw together a slinky dog antenna last month for funsies and somehow it’s pulling in every channel in my area clearer than my old store-bought one.

like… a TOY… is outperforming real gear. what even is life anymore??

anyone else got ridiculous homemade antennas that somehow just WORK? drop the weirdest ones below

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u/Scraven6 — 6 days ago
▲ 18 r/AntennaDesign+1 crossposts

Need help with QFH on satellite dish

I’m building a qfh for a 4’ dish. I tried a helical but the dish is too deep for it to illuminate. I need the qfh to be LHCP. I made a scaffolding for the frequency I need and 3d printed it. I ran my wires, but here is where my confusion sets in.. which short and long legs need to be soldered together and where does my center pin and my shield need to be soldered? I’ve asked Google, Grok, and Claude and all 3 of them are giving me different answers. The wires meet at the top of the scaffolding where the pigtail will be soldered. I need the top to fire towards the dish.

Anyone have experience with this that can give me the correct answer? Any help would be greatly appreciated!

u/meta_burn — 8 days ago

Grounding and reflected power in VSWR testing

I need help, I got into an argument with a coworker over whether or not we needed to replace a TNC connector on our watt meter when testing p25 trunked radios. The cable jacket and ground shield completely separated from the collar of the TNC. My coworker keeps saying that it’s fine because he just used it to test a radio, and it came up with 28w forward power and 78mw reflected. My point of contention is that we can’t rely on the numbers given anymore because the ground is cut. What effects on testing would we see with reduced grounding? Am I crazy for wanted to make sure we have good test equipment before sending radios out into the field?

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u/dib5k — 8 days ago