On Thu, 2 Oct 2008 16:30:50 EDT, Michael Coslo wrote:

Hi Bill,

Keep in mind that an antenna height that is NVIS on 80 meters, won't
necessarily be so on 40 meters.

I agree. My HF antenna is 3 dipoles, one each for 75, 40 and 20, suspended
vertically with one foot spacing and fed with a common feed point. The top
dipole is for 75, and the ends are about 25 feet high and the center droops to
about 22 feet. Each dipole works independently (with mild interaction) because
the desired dipole has a 50-ish impedance, and the other two have high
impedances at the current operating frequency. I can operate on 75,40 and 20
with only my transceiver's built-in tuner (2.0 SWR max). I can also operate on
15 (third harmonic of 40) with an external tuner.

On 75, I have NVIS. On 40, I can talk a half a continent away. On 20, I can
talk world-wide.
73 de Dick, AC7EL