Hi David,
It's not imposible but you will losse Quality .
The best result should be like cassette quality.
radio tuners haven't got digital decoding like satlites ,
even FM radio channel is not a real digital encoding,
so no way to get CD quality with wireless.
if you don't care about Cd quality ,making this ,is very easy.
I tried it before ,and worked perfect [except CD quality !!!]
I haven't got any useful shematic for this, :?
I just know this chip [ MC2833 from Motorola ] it should be good ,
just a problem! it's MONO,
beter to find a single chip sterio modulator ,use Google
Hope helped
Mosh