I assumed the same db gain (but none in particular) since the distance
to the horizon would be the limiting factor. As far as I know, the gain
will only come into play if the antenna is VERY high.

I'm not an expert, I don't play one on TV, and I haven't stayed at a
Holiday Inn Express in over four years.

Dan


JimH wrote:
"Dan Krueger" wrote in message
ink.net...

The difference in four feet (assuming the same gain the the antennae) you
will only be able to communicate 1.18 miles further.


True, or close to it depending on the db gain you used. ;-)

Calculation for Range of an Antenna:

6db Antennas: Square Root of Height (in feet) above water x 1.15= Range in
miles
9db Antennas: Square Root of Height (in feet) above water x 1.52= Range in
miles

So we are talking a range of roughly 3 miles for the 4 foot vs 4.25 miles
for the 8 foot.

Not a big difference as you said.