You might get a somewhat more representative SWR value if the yagi is
vertically mounted so that the reflector is closest to ground and the
director at the top.
The idea is that the reflector will partially decouple the close in
ground surface from the antenna. I've done this with VHF and UHF
antennas and found it works well, but at HF while it's better than
making a measurement with the antenna parallel to the ground but I would
expect noticeable changes when it is mounted atop the tower.
Jack K8ZOA
On 7/12/2013 10:50 AM, Phil Hystad wrote:
I know this is OT but there are so many knowledgable people on this reflector
that I can't pass it up.
A friend has a Yagi antenna (HF tri-bander) that he wants to measure the SWR
before he raises the antenna up on the tower.
Question: is this accurate or does the proximity of ground (maybe two feet
high)
so strongly affect the SWR reading that the measurement is not accurate.
73, phil, K7PEH
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