On Thu, 11 Aug 2005 13:05:17 -0500, "Ken Bessler"
wrote:

Assuming 2 identically equipped stations operating
mid day on 40m SSB, how far apart would they have
to be to see differences in propagation from a station
say 500 miles away?

Hi Ken,

If they (A and B) are separated by your local city/town/village, then
the common sense of the broadcast model would suggest that both of you
have an equal shot at it. Otherwise the entire broadcast industry
would have collapsed in the late 20's from lost listenership.

When I put this kind of test to a propagation modeler, and I tighten
the beamwidth of the antenna to 10°, then after the first hop, the
signal covers an area larger than a 70 mile wide county with its
footprint. I don't think your cross-town buddies are going to be left
out in the cold, if all things are as equal as you suggest.

73's
Richard Clark, KB7QHC