Hello. I am looking to buy this for my husbands 1998 Jeep cherokee XJ..Will this be good for that? And also what other parts are needed?

Hello, yes this is a nice radio that would be fine in that vehicle.With this said, along with the radio you will need the following items:Cigarette lighter 2 wire power cord, magnet mount antenna. These items can be bought on Amazon or you can get them at a truck stop.I recommend Amazon because of a lower price and free shipping and the secret nature of being able to hide your purchase if it's a surprise gift.Truck spec is a cheap brand for the 2 wire power cord and for the antenna I recommend one of the following: K40, Wilson 1000 or the Wilson 3000 magnet mount antennas.Those come with the antenna wire already attached to the magnet and all he would do is run the wire through the hatch or the rear door after mounting the antenna on the roof. It's really easy to do. Just hide the wire under floor mats and beside the seat up to the dashboard to the CB.Now if you are looking for a better radio and easier to use right out of the box, I recommend Galaxy or Connex as these are rock solid and all the knobs are right there on the front of the radio unlike this modern radio with most of the adjustments in menus which made me feel like I had to relearn everything over again. I prefer direct access.This Uniden Bearcat 980 has an annoying beep sound every time you change the channel. Those two other brands of radios I mentioned are more expensive but are what the big boys in my industry use in their big rigs. You should be able to compare the features of the Bearcat 980 with those of a Galaxy or a Connex CB and go on that alone to match up what you want. I read the other two answers you got, Why did they even bother...I hope this helps and as always just ask if you need more info.

Does it have a three pin plug or is a two pin for power connection?

Hello,It's a 3 pin plug.A great radio all around!Hope this helps.

Is this radio Double-Din sized? I see alot of pictures with it on the radio slot, or was that just a lucky fit?

This radio will fit in a double din with a single din radio with modification. It will not just slide into the slot. I have it in my ford f250s dash. I had to modify the double din brackets extensively with a dremel tool but it was not too difficult and only too about an hour. That being said it is doable because it is close to the same size as a single din radio, but it will not be as easy as it is to slide a radio into a din slot.**I have attatched pictures of it installed on my review of this product below*

Does it come with the power adapter, if not could someone point me in the right direction for a non lighter solution?

It comes only with a wire lead to connect to the vehicles 12 volt system or you will need to by a separate 13.8v power supply with at least 4 amps to use this radio as a base station. I say 4 amps because on SSB 12 watt operation the radio will perform at its best, Also it is not suggested to connect the radio using a cigarette lighter, for maximum operation and vehicle noise from such as alternator it should be connected direct to battery soldering all connections.