Art Unwin wrote:
I have on order a tilting system for my antenna to probe the
polarisation of incoming signals
for maximum audio clarity and gain.
There are instruments out there that can automatically tell you the
polarisation
without one taking the trouble to pan the antenna in different
directions.
Anybody out there follow such a procedure with the antenna or use a
homebrew
or commercial instrument to save time?
Regards
Art
There's lots of ways to do this. calibration is always an issue.

For instance, two helices wound with opposite senses can be run through
a variable combiner. (the helices can be on the same form, and are
coincident.

There'a variety of tripole antennas used for this sort of thing, too.

3 crossed short, resistively loaded dipoles or loops is also used.

A very clever scheme uses half loops sticking out of a conductive sphere
as a simultaneous E and H field probe. The electronics is all inside
the sphere, and you bring the data out on fiber optics.