On Mon, 10 Aug 2009 05:19:41 -0700 (PDT), ve2pid
wrote:

Does the pattern changes, i,e. is the TO angle going
lower above an horizontal line coming from the antenna?

Depends on wavelength vs. distance to nearest ground vs. angle of that
distance.

All things about the pattern are related to phase/time/distance.

73's
Richard Clark, KB7QHC