You would be better served (and preserve your portability) by moving your Router closer, adding an additional access point to boost your received signal at home, or running an Ethernet cable (with adapter for that model MacBook Pro.)
I live "in the woods" but my home is solid masonry construction, and has wire lath behind the plaster. it is a wi-fi 'dead zone'. I am up to 5 access points, which I chose to implement as separate routers in 'bridge mode' (DHCP turned off to make them access point only.) I have the luxury of using the whole wi-fi spectrum, because I have no competition from neighbors. You may not have that luxury, or perhaps there will be no competition in your 'fallout shelter' room.
For typical cable-TV setup. the cable-Modem/Router combo unit can connect to ANY cable tap in your home, you might just need different cable splitters.
if you have separate cable-modem and Router, you can run Ethernet cable between the two devices, up to a football field long. If Ethernet cabling is onerous, you could use Ethernet-over-Powerline devices, but setup can be sometimes take extra work in the US with typical 120 volt 2 phase wiring.