Scott Gordon wrote:

I have a 40 ft vertical fed with coax that I am using today on 60 meters
with excellent results. I have 34 radials under it now at about 43 ft.

I am wondering how I can use this antenna on other bands? 40, 20, 17, 15,
12, and 10 meters.

With a straight monopole, anything over 5/8 wavelength is
not a good DX radiation pattern. So if you are into low
angle radiation, the rule-of-thumb upper frequency limit
for a 40 ft. monopole would be about 585/40' = 14.6 MHz.
It would work well on 20m and deteriorate as the frequency
increases above 14.6 Mhz.
--
73, Cecil http://www.qsl.net/w5dxp