The Weboost Drive models come with an omnidirectional antenna. I've screwed mine onto the outside of camper, using the short mast and mounting adapter that comes with it. I admit it was mentally hard to drill a hole in the camper for the wire! I fastened the indoor antenna to the ceiling using industrial Velcro right over the couch where we use the phones. The booster is plugged into 12V and in a cabinet.
All carriers and all current technologies are boosted. 5G is a bit complicated because real 5G is only in cities and has a very short range. What most carriers call 5G for marketing purposes is really just a slightly faster LTE and it is boosted. I don't know if real 5G is boosted, but I don't camp in cities.
https://www.weboost.com/products/drive-reach-rv-2
As Charlie noted, you can use a directional antenna like a yagi if you want to aim at a particular cell tower with a home booster. Interestingly, if you use a directional antenna, you have to get both vertical and horizontal aiming accurate to get a signal.
All carriers and all current technologies are boosted. 5G is a bit complicated because real 5G is only in cities and has a very short range. What most carriers call 5G for marketing purposes is really just a slightly faster LTE and it is boosted. I don't know if real 5G is boosted, but I don't camp in cities.

https://www.weboost.com/products/drive-reach-rv-2
As Charlie noted, you can use a directional antenna like a yagi if you want to aim at a particular cell tower with a home booster. Interestingly, if you use a directional antenna, you have to get both vertical and horizontal aiming accurate to get a signal.