Thanks, the impedance of the half wave section is what I really
needed.I was figuring 5 to 10K. The info you and Cecil gave me got me
back on track
Installing a ground system here is very impractical. I wanted to see
how well the J antenna worked. If performance is acceptable I plan to
further experiment with multiple frequenciey antennas, an HF version of
the Copper Catcus. For now I would be happy just to get this antenna
working on one frequency.