More likely it was a mix of groundwave and sky wave, if the station was local, cancelling or reinforcing signal as phase shifted on the sky wave path.

----- Original Message ----- From: "Richard (Rick) Karlquist" <rich...@karlquist.com>
To: "Art Roberts - W5AER" <w5...@hotmail.com>; <topband@contesting.com>
Sent: Wednesday, December 24, 2014 9:23 PM
Subject: Re: Topband: 160m Sloping Vertical Antenna?




On 12/24/2014 3:39 PM, Art Roberts - W5AER wrote:
On the thought of a low dipole:

Years ago in Northern California, as an experiment, I had a VERY low
dipole and got some strange results. Listening to a local station, in
the afternoon, there was very deep QSB. We were able to talk, but with
difficulty.

73,
Art  W5AER


Were you cross polarized; IE was the other station running a vertical?
If so, minor fluctuations in propagation could result in major
fluctations of polarization cancellation.

Rick N6RK
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