I still have the factory batwing (Five years now) and have to say it has worked well. Obviously the most important things are distance to a tower, and knowing the direction to point the antenia.
2018 Forester 3011DS (Purchased 04/26/17)
2010 Flagstaff 26 RLSS (Sold 05/16)
2012 Ford F-150 Ecoboost, Screw, H/D, 3.73
1930 lbs CCC
2014 Jeep Rubicon JK
Going where the weather suits my clothes.