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I want to reduce the size of my 9 ft whip to around 7.5 feet, how much wire would I need to make a loading coil and would the coil be tightly space or a few mm gap between turns, I intend to use pvc coated wire stranded its about 2.5mm.

ok so I made a reduced size ground plane for cb, Im moving in the near future and have no idea how big the loft will be, or if it will even have a loft, Im using a 9 ft tank whip with 4 9 ft wires at the moment but I want something compact so I have ordered a sirio 4000 hp mobile antenna, and...

I have owned a Sirio top one, and it worked very well it was a quaterwave antenna with gamma match, however the astroplane was listed as a 5/8th wave, now the top one was clearly a 1/8 wave element with a 1/8th capacity hat, my question is, is the astroplane also a quarter wave antenna, because...

I had both and the 5/8th with its three radials worked a lot better the the half wave, gps, My test was on a guy 25 miles away s1 radio 3 on the gps s3 radio 5 on the gpe, both mounted on the same pole,