The radio reception in my E46 is poor. I do have an after-market radio and have checked i don't have a second fakra for the power to the aerial amp, so I think the amp is loom fed power.

I think the solution is to fit an aftermarket aerial and a rear mounted shark fin seems like the most discreet. I did see a post where some guy had used a magnetic sharkfin and run the cable in the rear window seal round into the boot etc but i'm struggling to find a decent shark fin with a long enough lead as there won't be room for a join in the window seal.

So maybe i just drill a hole in the roof and weather proof it ? Is it possible to drop the headlining enough at the rear in a coupe to a hand in to afix the bolt and run the cables to the c-pillar to pick up the aerial cable to the radio ?

open to other ideas too.