If you are tracking your race cars on oval or typical road courses, a mobile radio is not the hot set up. You would be better off with a portable radio and an external antenna. If you were racing off-road or La Mans whereas there are miles between the driver and the crew/pit then a mobile radio would be the set up and the pit with a raised base station antenna and maybe a portable repeater at a higher elevation point.
In the video, the radio was not installed in a good location. Reaching over to your side or behind you during a session on the track is not the ideal thing to do under those conditions. That would be a total distraction and may cause you to make a furtive movement in your driving. That installation was a very poor choice.
The antenna mount should have been a NMO mount with either a Phantom, quarterwave, or a low profile blade antenna.
The XPR mobile radio was also way overkill for several reasons. You don't need a 1,000 channels, maybe a radio with a channel capacity of not more than the total number of itinerant channels that would be licensed for would have been the smart choice. Maybe something like a Motorola CM200D or 300D or even a Kenwood would of been a better choice and a lot less money. He probably paid at least $1200 or $1300 for a radio that he didn't need.
In my opinion, the video is a good example of how not to install radio communications in a racecar.