Cecil Moore wrote:

Jim Kelley wrote:

I don't think it matters where it is, or how much space is involved.
For a single source to create an interferernce pattern, there must be
a reflector somewhere. An antenna tuner for example. Interference is
the result of the overlap of waves.


Do you consider a dipole in free space to be
a "single source"? There is no reflector yet
there is plenty of interference.

If there is no reflector and no splitter to redirect a portion of the
ratiated energy, but an interference pattern still results, then there
must be more than a single source. It should be fairly obvious that
both parts of the antenna must be present in order to generate the
dipole-type interference pattern.

73, ac6xg