The 210 was released around 1978 or so. How useful it is depends on what you want to listen to. It has 10 channels and only goes up to about 500 Mhz or so.
Well see im new to this scanning sorta deal so what can I pick up with it? I have a list of about 65 numbers but I put the first 10 in and I get nothing yet.. Police departments and fire departments...
You didn't say where you live, so we can't determine what you might be able to monitor in your area. It won't follow trunked, or digital systems, but for conventional analog it would still work just fine.
As for the antenna. As I recall, that model uses the old Motorola type antenna connector. Most all the antennas available today use the BNC type connector. Radio Shack sells a Motorola-to-BNC adapter plug, Cat No 278-160 for $5.49, that would solve that problem!
I had a 210 and it was a good radio and I also had the Bearcat 250 also and it was good radio also in it's day. I had them both hooked up to an outside antenna and I could pull in the stations on them. The antenna that came with the 250 and the 210 were the telescoping wick that usually came with those particular radios. It's not much but it is better than nothing. As far as what you are wanting to listen to it might help by checking out the database at www.radioreference.com. Chances are the systems you are wanting to listen to might have changed.
I purchased a 210 xlt in the earky 80's and it was a good radio for conventional frequencies up to about 512, with 18 channels. It worked up to about 2003.
I've still got mine and it still works (unlike me)..make sure you change the backup battery in the rear of the unit...it will go dead and/or possibly leak over extended periods of time.
Kings County appears to be on an 800Mhz trunk system. When the 210 was made those were just being deployed and the scanner definitely will not work on it. I'm afraid you are out of luck.
If you can post a sample of the frequency list here, I'm sure we can tell you for sure.