basically a trip to home depot got me a 4" diameter PVC pipe and some aluminum flashing. used ratchet straps to secure the flashing around the pipe to bolt it all on. i did a coil inductor 1/3 of the way up the antenna in a space between the flashing, and i left a cpl feet for transmitter/feedline mounting below the antenna. for the loading coil i took a smaller PVC pipe with taps at every turn, attached the sheild to the bottom of it, and center to the roachclip for quick and precise tuning and run a 120pf arco trimmer from top of that to ground. now i did this test with no earth, heater, or electrical ground outside of what the small piece of coax sheild presented. i got a 1:1.3 match on center, and a 1:1.5 swr 10khz to either side, and 2:1 20khz after that, according to my $65 chinese ant. analyzer. now, to see how well it radiates.
October 3, 2016 - 14:14#1
i might have solved the Q problem with a near-center loaded ant.