Brian wrote:

If it's only receiving strong signals, then the most likely thing is
that the antenna is not powered. Yes, it does get a phantom supply on
the co-ax. If the radio is not supplying this then you can get an
adapter from places like Halfords which goes in the co-ax line, and
you connect a source of 12v to it.

OK, I borrowed one of these adapters and it made no difference, so I guess
that means the antenna amp is fried. So it looks like I need to replace the
antenna. Is it worth getting a better (longer) antenna and forgetting about
the amp, or is the cable run too long from the roof mount and so requires an
amp anyway? Any tips for getting at the antenna from below - Haynes seems to
advise against trying!

KotF

In article , lid
says...
Brian wrote:

If it's only receiving strong signals, then the most likely thing is
that the antenna is not powered. Yes, it does get a phantom supply on
the co-ax. If the radio is not supplying this then you can get an
adapter from places like Halfords which goes in the co-ax line, and
you connect a source of 12v to it.

OK, I borrowed one of these adapters and it made no difference, so I guess
that means the antenna amp is fried. So it looks like I need to replace the
antenna. Is it worth getting a better (longer) antenna and forgetting about
the amp, or is the cable run too long from the roof mount and so requires an
amp anyway? Any tips for getting at the antenna from below - Haynes seems to
advise against trying!

KotF


Original post has expired but is this a VAG car?
if so, the antenna amp is in the headunit, that is why you fit the
antenna booster with a 12v source when you change the headunit.