On Tue, 27 Nov 2007 07:35:07 -0800 (PST), James barrett
wrote:

Hi, I don't understand how you can add elements to an existing antenna
and have it still work on the band it was originally made for. Do you
still need a tuner? Or do you remove the 20m elements to transmit on
10m?

Hi Jim,

Adding a new band's element will likely disturb the performance of an
existing one. However, it will be slight, and if you anticipate this,
you can construct a two band antenna and tune both. Similarly, you
can construct three, four, five.... band antennas using similar
principles. There is, of course, the compounding of difficulty as you
increase this count, but that doesn't preclude it being done
successfully.

73's
Richard Clark, KB7QHC