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[Doctor Gollum]

That's more like it

[STEMO]

OOOPS, wrong thread.

[LC0112G]

With the roof aerial disconnected, and the radio pulled out...

Check the resistance of the coax screen from end to end. Should be zero near as dammit.
Check the resistance of the coax core from end to end. Should be zero near as dammit.
Check the resistance from coax core to coax screen. Should be infinite near as dammit.

If ALL 3 of these conditions are correct, then the wire is almost certainly fine and the fault will be elsewhere.

[iansoutham]

With the roof aerial disconnected, and the radio pulled out...

Check the resistance of the coax screen from end to end. Should be zero near as dammit.
Check the resistance of the coax core from end to end. Should be zero near as dammit.
Check the resistance from coax core to coax screen. Should be infinite near as dammit.

If ALL 3 of these conditions are correct, then the wire is almost certainly fine and the fault will be elsewhere.

Fault will be at the front behind the radio almost certain, but will be double-checking when pulling it all apart at the weekend in the cold

[LC0112G]

The fault with my wiring was the connector to the roof aerial up behind the roof lining. Ok - that was a Sat-Nav coax wiring fault but I wouldn't trust any of the connectors.

http://www.omegaowners.com/forum/index.php?topic=88816.0

[iansoutham]

Update:

Changed the wire from the passenger footwell to the radio using a RAKU II to ISO converter lead and extension via the DAB unit (pass-thru so works DAB or analogue) and problem solved.

Looks like the original lead has about 3 potential breaks in it in the first 12 inches from the radio so no way to remake connections.

Have left it in place as cannot be bothered to try and remove at the moment.

Thanks for the help and it looks like it can be either side of the car for aerial leads....