On 14 Oct 2006 06:32:21 -0700, "CW" wrote:

Fellows,

I've been wondering for some time now why amateur operators don't build
their Yagi antenna's
so they can be raised and lowered about 10ft in addition to being
rotated.
[snip]

You make the all-too-common assumption that there is one "take off
angle" and apparently believe that no usable radiation occurs at any
other angle.

You wouldn't (I hope) believe that there is one azimuth angle and that
if your antenna isn't pointed *exactly* at the target you're SOL, so
why the concern about height?