On Sun, 13 Apr 2008 11:18:06 -0700, Richard Clark
wrote:

On Fri, 11 Apr 2008 08:02:04 -0400, "Robert11"
wrote:

For the scanner frequencies around 118 MHz, e.g., I realize FM is
essentially line of sight.

Are AM transmissions also line of sight ?

Same question, but for the higher freq's around 800 MHz ?

Hi Bob,

John and Ralph pretty much cover some of the familiar turf. I would
add (or perhaps extend what has been said) that atmosphering ducting
can extend that range thousands of miles.

One example that I personally observed (quite literally) was watching
TV programining out of Edmonton and Calgary Canada while I was living
in Colorado Springs, Colorado. There were times I could watch an
entire movie before the duct faded away.

73's
Richard Clark, KB7QHC

Yup, ducting, meteor scatter etc can all provide extended VHF range.
I've only done about 250 miles on 2 meters, though on 6 meters my
farthest contact was about 3000 miles...........did as straight a line
as I could on MS Streets & Trips to 'calculate' that so there may well
be some error.

That was pretty good range for a video signal to carry, Richard; was
that on an older tv that actually allowed you to [fine] tune?