Mobile Antenna for HP-2

Have been doing a lot of reading on the Antenna Forum and have concluded that getting a Larsen NMO150/450/800 fixed mount antenna makes sense for the type of monitoring I am doing. My only concern is VHF-Lo band for Maryland State Police. Any suggestions on a low band mobile antenna to mount with the Larsen 150/450/800? Also any suggestions on a coupler for the single scanner?



Also, antenna will be going on the roof of a 2015 Land Rover Sport. Roof is not metal so ground plane antenna will not work. Still trying to figure out if Larsen 150/450/800 is ground plane antenna.



Monitoring in Philadelphia, Pa., Deleware, Chester, Montgomery Counties in PA and Kent, Cecil, Queen Anns County Maryland. Mostly police and fire. Some P25



Thanks

Mobile Antenna for HP-2