In most locations in the US any entity can hang wire on utility poles (the poles are often owned by the city, with an open access policy -- this is how CATV and PSTN wires are up there on poles, and more recently 5GUWB base stations). There are certain requirements (e.g. insurance, you have to have assets on hand to repair your cable when someone drives into a pole, you need workers who are certified to work near high tension wires, etc). Usually you can outsource that stuff, for a price, possibly to the same contracting company who does the same work for Comcast.