If using data the design of the weboost rv unit may slow it down. If there is poor signal it may allow you to connect where this was not possible before and have some data capabilities.
I dislike the "broadcast" side antenna on mine. You have to be not closer than 15 inches--but not farther than 30 inches for best results.
The external antenna needs to be a long way from the internal antenna as well.
The external antenna needs to be on a metal plate to provide a ground plane. I use a pizza pan from a dollar store.
I have one phone I use mostly for data. I've had good success putting it in a plastic bag after activating the wifi hotspot feature and placing it as high as I can get it on a nearby tree.
