Lots of questions to address here. The directional antenna does need to be aimed. As such it is really only useful for home applications or campsites where you intend to stay for weeks. For overnights it's too much trouble unless you just have to have cell service. The antenna needs to be on a mast so you can rotate and aim it. Finding the correct direction can be from the mapping program or a signal meter but that's more hassle. Best to just use a roof mounted omnidirectional antenna, an amplifier, and take what you get.
The available signal amplifiers should work with multiple services, multiple frequencies, and 4G/5G. You just have to check the specs before buying one. The frequencies are allocated by the FCC to all vendors so they're common.
The available signal amplifiers should work with multiple services, multiple frequencies, and 4G/5G. You just have to check the specs before buying one. The frequencies are allocated by the FCC to all vendors so they're common.