so ive been on the air for about 8 months now using a buddipole i borrowed from a club member and i finally decided its time to build something permanent. going with a simple 40m dipole to start, probably hung inverted-v style from a tree in the backyard. got some 14awg stranded copper from the hardware store and a SO-239 center connector i pulled off an old rig i scrapped.

my question is mostly about the feedpoint. ive seen people use all kinds of center insulators, some homebrew ones from PVC or whatever, some bought. does it really matter that much what i use there as long as it keeps the two sides from touching? also wondering about the choke - i know i need one, been reading about ugly baluns made from coiling the feedline, how many turns of RG-8X are we talking for 40m? ive seen numbers all over the place. the tree is maybe 35 feet at the apex so the legs will slope down at maybe 30 degrees or so from center, not ideal i know but its what i have.

cut to resonance first then trim right? or should i start longer and tune from there. sorry if this is basic stuff

yeah start longer and trim, always. the formula gives you a starting point but real wire in real environments is never exactly what the math says. for 40m i usually start with the full half wavelength calculation using the 468 constant and then add maybe 3-4 inches per side before i make the first cut. then check SWR with an analyzer, trim a little at a time from each end equally. you cant put wire back on once its gone.

for the center insulator honestly anything non-conductive that holds up outside works. ive used sections of cutting board, PVC end caps drilled out, even some thick nylon cutting board material. the commercial ones are nice but not necessary at all. the coax connector is probably your most important joint - seal it up real well with self-amalgamating tape after you solder everything, water getting in there will mess up your day eventually.

on the choke - for 40m with RG-8X people usually do around 8-10 turns at maybe 6 inch diameter, so like a 6 inch coil form. some guys use a piece of PVC. its not super critical but do something, an unbalanced feedline against a dipole will cause all kinds of RF in the shack issues, trust me ive been there.

inverted V off 35 feet sounds about like my setup, works fine on 40m. one thing i'd add is dont stress too much about the angle of the legs as long as theyre not basically horizontal. you lose some of the pattern advantages but for general use and getting on the air it doesnt really matter. i ran mine at like 25 degrees for two years before i got a taller support and worked plenty of DX.

also the 14awg stranded is totally fine, some guys swear by solid for less stretch but stranded has been working for me for years outdoors. just make sure whatever you use at the ends to terminate the wire and attach to your rope insulators is secure - thats usually where failures happen in my experience, not the wire itself.