"robgraham" wrote in message
...


Yep, Tony - been to Google and read that. Google might answer my
exact questions if I could find the right search terms but then that
doesn't help anyone else. It's the exact questions that require the
answer.

The velocity factor affects the length required to be a wavelength.
It affects the matching, etc and hence the performance at the required
frequency.
E.g. a quarter wave isn't the same in free air as it is in coax or on a yagi
for the same frequency.

I would move the router about before touching the aerials.
A move of a few inches can make a big difference.