I've seen military LOS shots stretched 40+ miles, with
1 Watt pwr out, small horn antennas at both ends, and
some altitude.

At this range terrain matters a lot - I know of a shot
which inexplicably died at night, turned out an inter-
vening airfield opened & closed its hangar doors with
the sun...

regards, Jack

Jim wrote:
>
> Some of these systems, properly engineered in a
> point-to-point configuration using fixed, gain
> antennas (Yagis) mounted on masts/building roof
> tops are capable of appreciable range.
>
> It is also a matter of terrain and man made obstacles
> as well.
>
> The bottom line is, you won't get 20 miles between
> units with unity-gain back-of-the-set antennas - but
> equipped with yagis at 50' at each end with no
> mountains in between - 20 miles could be expected ...

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