Topband: Need help feeding tower on 160 AND 80

[Brian Machesney]

Gang,

I have an 80-ft tower topped by an KT34XA (elements insulated from 32-ft
boom) and 40-2CD (only reflector electrically connected to 22-ft boom). I
have 8 x 50-ft lengths of 4-ft wide welded, galvanized steel fence for a
ground screen. No other radials.

I have successfully matched this on 160 with about 350-pF series capacitor
to a 45-ft #12 gamma wire spaced about 3-ft from the tower.

I also want to feed the tower on 80. I have been hoping that the 160 gamma
wire would "disappear" electrically when it is open-circuited. Given the
complex configuratino of the GAP vertical antennas, this may be but a faint
hope. I'm having trouble creating a good match on 80 with a simple gamma
feed scheme.

Has anyone on the reflector tried to feed the same tower on two bands?

Please reply off-reflector.

Thanks and 73,

Brian K1LI