i initially phoned CBS about the Aerial and the chap the other end was very helpful in that he got one off the shelf to get measurements, very impressed with the service.The Aerial came OK and has lots of bits to aid fitting but didn't seem to fit the product and the alloy bit broke just showing it up to check the fit, instructions could have been better but wiring diagram was good. After some time modifying the cars original aerial mounting it all came together and now works very well and am very pleased with it.