so ive been putting off building my own antenna forever and finally just decided to do it last weekend. going for a simple half wave dipole for 40m, nothing fancy. i got some 14 gauge stranded copper wire from the hardware store and some SO-239 connectors but i'm not sure what to use for the center insulator piece. seen people use PVC, egg insulators, that kind of thing. also wondering if the wire gauge even matters that much for a dipole or if i'm overthinking it.

i calculated the length at roughly 66 feet total (using the 468/f formula) for around 7.150 mhz. cut it, soldered on the connector, and just kind of taped the whole center together for now while i figure out what to actually do. SWR came out around 1.4:1 which honestly surprised me, thought it'd be worse. anyway the question is more about the mechanical side of things - what are you guys actually using for the center piece when you build your own? dont want it to fall apart in the rain

14 gauge stranded is fine, honestly anything from 12 to 18 works for a wire dipole, the gauge matters way more for current handling on high power rigs than for any electrical length stuff. for the center insulator i've been using 3/4 inch PVC pipe for years - just drill a hole through it on each axis, run the wire through, put a knot in it so it can't pull back, solder your SO-239 right to it. ugliest thing you've ever seen but mine has been up for six years through some pretty nasty winters. the tape is definitely not gonna hold, especially when the element starts swinging around in the wind and flexing at the feedpoint. that's where most homebrew dipoles fail, the mechanical stress at the solder joint.

1.4:1 off the bat on 40m is actually pretty decent, you're probably close on length. might creep up a bit once you get the thing in the air at real height versus just testing on the ground or whatever you did.

i just use those nylon dog bone insulators from dxengineering for the ends and a small piece of HDPE cutting board for the center - drill it out, use stainless hardware, works great. some guys 3d print their own center insulators now which is kind of cool if you have access to a printer. your swr sounds reasonable though, 40m is pretty forgiving