Probably your best shot would be to measure the AGC voltage. That's a clear --and relatively easy to measure-- sign of signal strength. e.g.
Read the full replyAre there any home-brew designs for measurement of field/signal strength to check TV channels, please? I have an old set that might be opened up for tuning if that is possible. We have had some rather dubious data given by a contractor and a check would be useful.
best channels period..
Perhaps worth telling what you've been told?
Probably your best shot would be to measure the AGC voltage. That's a clear --and relatively easy to measure-- sign of signal strength. e.g.
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