Re: Is the mains 'earth' good enough?
Some mains earthing arrangements can introduce some noise with some radios tuning some bands. I haven't found my mains earth to be a problem with normal broadcast reception, and mains borne interference mostly arrives down the live wire. It's quite a lot of work to set up different radio earthing arrangements so it's well worth trying the mains earth first and seeing what happens.
It was normal practice for the chassis of valve sets to be left floating before the 60s, meaning there was either no earth connection or connection to a separate radio earth. It is considered bad practice to leave metalwork floating like this now for safety reasons.
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