It’s Comcastic, Or: I Accidentally Bought a House Without Cable
As someone in the comments section noted to the author - there are plenty of short haul, unlicensed spectrum, wireless bridges available today that are very affordable.  Even if he went with something more long haul oriented he could easily clear well over 30 miles LoS at over 500Mbit (https://www.ubnt.com/airfiber/airfiber5/) in real-world expectations.  I would put the money into building a tower on my property and find the closest fiber plant Comcast has for the HFC node that services the general area and make them give me a L3 drop to this bridge.  Having done this working for a cable provider in the past, it's trivial and inexpensive (costing well under $10k for the expensive equipment, generally a 5 mile link can be done for under $2k).Reliance on Comcast won't get you anywhere in most cases, but there are options for this guy other than selling his house.