We use a weBoost Drive 4G-M Cell Phone Signal Booster with the optional larger antenna. Like the others have said, no signal no boost. But at 1 bar it will boost to 3-4 and at 2 bars 4-5, enough for streaming without buffering. We have a fiberglass high top so I use a 16" square piece of galvanized to put the antenna on and just sit it on the roof, when parked of course. We use our cell phones as hot spots so once we have a good signal on one of them we have good connectivity for a tablet, laptop or smart tv/dvd player. I wasn't happy with the price, but since we stay mostly in areas off the beaten path the "emergency use" factor helped its justification. Overall, we found it to be a worthwhile investment.
2007 Ford EB250 EB17