For cell phones (and cellular internet) a few things are important
HEIGHT (Height is might), Antenna gain, Reciver sensitivy and a clear path.
The Wnegard Cellular/Wifi- System goes on the roof so there are no walls (just the RV-Transparant dome)
It is higher
I can't comment on the antenna since I've not one but if it is directional then there is gain.
and they make a very sensitive receiver. (Good one)
In some cases (park wi-fi) all the above apply again as well... In some cases height is not as important with Wi-Fi but for park wi-fi getting over your next site neighbor's rig means less walls. and if he's towing an airstream (Faraday cage/RF wall) then height is ultra important.
