Trying to find the right gear

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I'm going full time in an RV and I want to be able to use the internet. I've got a pretty good idea about how to configure the network (I'm CompTIA A+ cert), what I'm not sure it's which gear to buy.

Currently have an Apple airport extreme (willing to replace if necessary). I'm figuring on getting a wifi bridge and a directional antenna. Connect the bridge to local wifi networks and use it as the WAN connection in the router to create a new wireless network on my RV for all my devices. This is necessary because I'm not always within range for good connections and my rig acts like a faraday enclosure.

I know some wifi bridges aren't good for streaming, and I'm thinking three may be a single box solution (stand alone router that can handle the job without a separate bridge) as well but I can't find it.

Can you help?