Richard Clark wrote:

Otherwise, look for a yagi with about 30 degrees of beam width (in the
vertical polarization).

Wow that would mean a large FM directional antenna would it not?

I'm looking at an 8 element, and the beamwidth is + - 21 degrees, that be 42
degrees of beam width. But, it's not clear whether that be horizontal or
vertical beamwidth, presumably horizontal. I'll have to check. Maybe an 8
element might have a 30 degree beamwidth in the vertical.