so ive been putting this off for way too long but i finally got around to building a simple 40m dipole out of some 14 gauge stranded copper i had laying around in the garage. fed it with 50 ohm coax through a choke balun i wound myself on a mix-31 toroid, about 10 turns or so. got it up in an inverted-V config with the apex around 30 feet on a painters pole i strapped to the fence post.

here's the thing — i cut it to the standard formula, 468/f, so each leg is roughly 33 feet. resonant frequency came in around 6.9 mhz on the analyzer which honestly surprised me a little. i expected it to be close but not that far off. the environment around it is pretty dense with trees on both sides and the legs are sloping down at maybe 30 degrees or so, could that be pulling it down that much? i know the inverted-V loading effect shortens the resonant point somewhat but wasnt sure how significant it would be in practice.

planning to trim a little at a time but wanted to get some input first before i start hacking away at it. also debating whether to just add a tuner and call it a day since my rig has a built in one. any thoughts on whether its worth chasing the resonance down to exactly 7.2 or wherever i want it vs just using the tuner?

yeah the inverted-V thing is real, the closer those legs get to horizontal the more it shifts. at 30 degrees from horizontal you're going to see a noticeable drop, some people use a correction factor around 0.95 or so instead of the standard 468 constant when theyre doing an inverted-V, so maybe try 444/f and see where that lands you. trees being close will also load it and pull the resonance down a bit, electrically they kinda look like a lossy ground plane hovering near your wire which isn't ideal but its not a disaster either.

as for the tuner question — honestly if you got a decent choke balun on there and the swr isnt like 5:1 or something wild, the built-in tuner is fine for casual use. but if you want to really understand what the antenna is doing, trimming it to resonance first teaches you a lot more and you'll have a better sense of its actual bandwidth. i'd trim it. takes like 20 minutes and you'll feel better about it.

same thing happened to me when i did my first inverted-V, came in low and i panicked thinking i measured wrong. turns out it was fine, just needed a small trim. i went maybe 2 inches at a time per leg and checked with the analyzer each time, took a few iterations but eventually got it sitting right around 7.15 which is where i wanted it for phone.

one thing i'll mention — make sure you're trimming both legs equally if you want to keep it balanced. i forgot to do that the first time and ended up with slightly different leg lengths which probably didnt matter much electrically but it bugged me lol