Poor radio signal


Hi all, I have a 2012 Peugeot 208 and a 2009 Peugeot 4007, both cars suffer from a poor radio signal, doesn’t hold station, drifts in and out whereas my wife’s 2008 holds signal perfectly. Tried swapping the screw in section of the antenna but no change, can anyone help with advice on how to resolve the problem? Many thanks
Could be radio on its way out as French cars and electronics are not the best.
I used to have an old wing aerial for checking if it was an aerial or radio issue.

What make of radio factory install or upgraded one.
Get model of radio and google that issue might open up your eyes as not locking sounds like radio.