We have a 2013 GT 86 and the radio reception has almost disappeared . Auto electrician says the connection from the roof aerial to the back of the radio is suspect . I replaced the radio - no change . I tried to locate an after market replacement lead with correct connectors - no luck . I have seen on ebay a TOYOTA GT86 INTERIOR ANTENNA AMPLIFIER MK1 2013 K20152- see below . Can I plug this in the back of the existing radio and do without the roof aerial ??. Comments advice please . TIA Bruce