The RFMAX RSF-DB-G4W-FFS 3-in-1Roof Mount Sharkfin style antenna is the best choice for a roof mounted unit operating from 698 thru 5875 MHz.  The antenna is ideal for combining GPS, 698-2700 3G/4G/LTE cellular data communication and 2.4 / 5 GHz WIFI/WLAN in one, small, covert package.  Equivalent to antennas from TaoGlas, Mobile Mark and Antennas Plus.  Optimized for use with Cradlepoint & Sierra Wireless modems: LS300, GX440, GX450 & RV50.