Really, the only difference between handheld and mobile, is that you'll typically have better and louder audio in a mobile, and you don't have to deal with battery issues. The better audio can be a big help hearing stuff in a noisy car, but not in terms of reception. As mentioned... You can get mounts that flip down... and I would just get an antenna that focuses on what you have the hardest time picking up. The strong stuff will come in on just about anything. So for instance... If you have a hard time with VHF but 800 comes in strong. Just get an antenna for VHF and the 800 will still come in fine. People assume you have to have an antenna that technically says it is for each band you want to hear, but that's not really the case. But the 'through glass' types aren't really going to cut it.