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@Sirius - when the SWR meter is placed inline, both this meter & the rig SWR meter show exactly the same poor SWR.
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This again suggests a possibility that the radio is going unstable so that a high percentage of its output is on frequencies to which the aerial presents a bad SWR. That's the thing about SWR / power meters, they don't really care, up to a point, what frequency the signal is. They will still show it.
I wouldn't normally swap out thick coax for thin coax - the reason you're using thick coax to begin with is because it is lower loss. It is admittedly harder to get it to go around corners and the radio can often end up where the coax wants to be, not where you want it to be.
A bad time to be having trouble with your radio. I'm in far NW Scotland at the moment and for a couple of hours yesterday I could hear UK stations from all the way across the south, including south Wales. Even managed to work a few (Midland 78, 4W FM).