robwilson said:
For the company plug.... RS also sells the adaptors both FM Modulator as well as cassette.
However, *most* FM Modulators broadcast on 88.1, 88.3, 88.5 & 88.7/9. If these frequencies are occupied in your area, or even nearby frequencies, the FM modulator generally doesn't have enough power to override even a low watt transmitting station. As much as I'd rather sell you $30 bucks of stuff, the $10 version (if you have a cassette player) is a much more reliable method of playing through your radio. Caveat, if your 88 freqs are clear the fm modulator works awesome.
Consider a
powered/amplified auxillary speaker. Generally this is better capable of handling the uncompressed sound you will receive with your scanner. Snaps, pops, buzzes and scratches you pick up could damage your car stereo speakers, especially if you turn it up so you can hear while driving with the windows down.
In my case I use a monaural single ear, earplug. This allows me to hear quite well in my open topped daily driver, plus it keeps me legal as I still have one ear for emergency vehicles.
