Re: J-pole antenna.
If you want a J-pole I obviously recommend his.
I have spent the last few days writing a section about antennas and antenna gain vs coax length. How high a mast is high enough and what are the trade off's between height, coax loss and antenna gain. It is a complex subject.
Probably more than you wanted to know....
I talked to Dr. Fong yesterday. He was very helpful and his price can not be beat.
Blake