Hello all - newbie here - be gentle! I'm on the verge of buying a TomTom Go, but am concerned that the GPS signal won't get through the windscreen. Does anyone have 307 XSi and a TomTom Go and if so, can they confirm whether you get a signal and if so, where best to place the unit etc. I've been unable to find a definitive response from other posts / sites etc. I asked the question of TomTom support but got a generic response about GPS not working with athermic windscreens. I think the 307 XSi has one of these, but they mentioned also that there "might" be a hold behind the mirror where the signal could get through. I'm not about to buy one just to try that out. I know you can get aerials, but I don't particularly want extra wires in the car and I don't know where I could hide the external aerial on the roof and still make it look neat - especially as it's black and my car is silver. If 307 / TomTom owners do have to use the extra aerial, can you suggest how best to fit / route it. If anyone has any similar experience, please let me know. Thanks webbo73