I recommend the Midland 75-822. Can be used as a handheld with the included battery pack, or slide off the battery pack and slide-on the included vehicle adapter that has a cigarette-lighter plug and a standard PL-259 CB antenna connector to go to an outside antenna. This is much more comfortable to use while driving than other models that make you connect the external antenna to the top of the unit (with a BNC adapter to the antenna, which affects the signal) and another wire coming off the side to the cigarette lighter.
If you've got to go with a removable magnetic-mount antenna, your top choices are K40 and Wilson, and my CB guy (who sells both) recommended the K40 at about 1/2 to 1/3 the price of the Wilson.
This setup worked great for me until I got the Jeep. Still works great as my loaner or when convoying with family.
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2010 Jeep JKU Rubicon | 35" KM2 & 4" Lift | Skids | Winch | Recovery Gear | More ...
'13 Wheeling: 8 Camping: 6 | "The trail was rated 5+ and our rigs were -1" -Evan@LIORClub