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Usual to plug the radio etc under test into the isolating transformer.
The output of the transformer should float. Neither end grounded.
A GFCI (RCD on this side of The Pond) is of no use on the output side of an isolating transformer. Apart from the rare and special case of a failure of the transfomer itself it doesn't give any extra protection on the input side either.
If working on a hot chassis (live chassis in UK/Europe) set an isolating transformer is essential if you want to connect testgear to the set. Otherwise you can make sure the chassis is conencted to neutral and use a GFCI/RCD.
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