Ron Hardin wrote:

Doug Smith W9WI wrote:

starman wrote:
True but I can get 1130-NYC and 1030-Boston with relatively strong
daytime signals. My antenna is not long enough to be directional for MW.

Interesting.

Your antenna probably *is* directional for MW, just not predictably so...
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

Every small antenna has the same pattern, a donut with a single axis of opposite
nulls, for its electrical response and for its magnetic response.

So if it's chiefly electrical or chiefly magnetic, it's a donut.

You get deep nulls mostly by constructing small antennas so they are entirely
magnetic or entirely electrical. Otherwise the out-of-phase electrical and
magnetic responses fill in each other's nulls.

Or you can phase-shift the electrical response and get a unidirectional
combination electrical/magnetic antenna, eg. a loop plus a co-located whip
combined with a phase shift.

The explanation I favor is the WHAM groundwave signal is weaker than the
other stations I mentioned in this thread because of unfavorable soil
conditions and/or a deteriorated ground radial system at the antenna
site. I think those are the most likely causes of reduced daytime
coverage. It would be interesting to know what their (WHAM) daytime
coverage was a few decades ago, to determine if it has deteriorated over
the years.


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