if you change the radio you have to make sure the radio will work with the booster, if yours is the one that takes the signal from the rear window heat strips, you will have to put an ordinary arial on as they are the one's that the most cause the problem, they only work with the omega radios. 
Sorry, but thats utter crap. 
The problem that will not go away is that the aerial is inside the car, and you can liken that to having a tv aerial inside the loft - it simply isn`t that good. With the standard stereo needing nothing more than a damp piece of string for reception, it kind of works after a fasion, but when you put an aftermarket stereo in with a highly sensitive tuner, the aerial simply cannot cope. Results are really dependant on te brand of stereo fitted, but generally speaking, in a Vauxhall, an aerial is an aerial.

nope sorry say's it in the hand book, mine was the same with my radio had to change the booster as not compatible, omega radios are low range to a booster, were as new radios are high range, say's it in the book i got for the booster.
Not often I say this twice,
But again - thats utter crap.

But if thats what Vauxhall have put in a book to get you to spend money with them and purchase one of their stereos, then I`m afraid that I have to say, more fool you for believing that.

You will see from the bottom of my note here that I am a bit of an expert when it comes to car audio, and I can say with absolute confidence that virtually
ANY radio can be connected to the Omega
WITHOUT any requirement for an extra or alternative booster, and the signal strength is going to depend SOLELY on the performace of the radio when a less than adequate antenna (std Omega one) is connected. You will find though, that the high performance aftermarket radios are a little more fussy about the aerial though, and for best results, it may be advisable to fit an aftermarket external one.
