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Thank you to everyone for your inerest and comments.
My set-up has been reviewed by Keith Hamilton and he is thinking that my ground is poor.
He is suggesting that I have an “elevated ground plane.”
I should try to set up my transmitter in the middle of the roof and have 64 copper wires radiating out from the center with the transmitter grounded to the center of the radials via a copper ring. The groun plane would be made of #12 ground wire.
My roof is big enough that I could do almost 50′ radials, but he is thinking 25′ should be sufficient. I really don’t know if I have the choice if it is better to have twice as many radials or the same amount of radials but twice as long.
Any comments about this idea? (I would still also use my other ground wire for lightening protection).