Unfortunately, there is no way to kow how well a CB will work in a given situation. All you can do is tune it. Some days you might could talk across the country, others you might be lucky to get across the street.
Really the only differences between CBs is how much power they have and what additional features they come with. For example: some you can get the weather stations with, some have a PA function, some have different meters built in, some will scan all channels, etc.
As for antennas, you can get a fiberglass or steel whip in different lengths. They essentially all work about the same, provided you can get the SWR right. In my experience, permanent mounts (to the body, not glass) work better than magnet mounts.
I would recommend the Cobra 75 WX-ST previously mentioned, as it's a good basic CB that you can easily remove if needed. As for antenna, you first have to decide if you want to permanently mount it or not. If you do, I recommend a Firestik II, or a full 102" steel whip (which is the best you can get).
As for mounting locations, you want to make sure at least 2/3 of the antenna is above the highest part of the roof (including a roof rack, etc.). So, where you decide to mount your antenna, determines what length you should get. I have a 5' Firestik II mounted to the rear swing gate door jamb above the tail lights.
I know there are a couple different topics about antenna mounting locations you may want to look at to get a better idea of what others have done. It's the antenna and mounting that determine performance more than the CB.
Hope I was able to help.
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