I use my cell phone for a hot spot. We have a generous plan and as long as we don't watch too many streaming movies per month, we have never gone over.
I tried everything to maximize campground WiFi and the connections are so "catch as catch can" that I just gave up trying.
I installed a WiFi router and connect the router to the phone. That way the router can share the connection with other wireless enabled devices like my printer and we can still share files between devices.
I store digital versions of movies and music on my small NUC computer and stream from that to the TV and surround Sound system via HDMI.
Bluetooth keyboard and mouse completes the system.
Amazon.com: Intel NUC D54250WYK1 Intel 4th Gen Core i5-4250U Processor with Power Cord: Computers & Accessories
If you can use a screw driver without hurting yourself you can buy the "kit" version and add your own hard drive and RAM for a custom system.
Intel NUC NUC5CPYH
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW