On 12/24/2021 10:39 AM, Kevin Zembower via TowerTalk wrote:
Is this adequate for a ground plane or counterpoise?
Yes
I know it's not the
mass of a vehicle. The SWR is pretty good, I think. It goes from about
1.45:1 to 1.3:1 over the VHF band, and 2.5:1 to 1.3:1 in UHF (with a
consistent set of big fluctuations at 440 and 445MHz. What's that about?).
Either resonances in the sheet steel based on its dimensions, or
conductive surrounding objects. SWR is NOT a measure of antenna
performance, it only increases loss, and for the values you've measured,
not by much. If the feedline isn't very long, I wouldn't worry about it.
But I WOULD use coax bigger than RG58, which gets pretty lossy at VHF,
even more at UHF. RG8X is a good choice.
73, Jim K9YC
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