Commonly, the ISP (Comcast in your case) doesn't allow this: a subscription is for just one household. So the best thing to do is to ask them to extend the services to your street.
Then, in the USA, you must have to ask the FCC or the local or state equivalent about the legal issues. You might have to get their permission to be a wireless operator.
No fibre optic services are available on our road and wont be for a long time but, the street in front of ours has cable services with virgin media.
So my question is:
If I was to pay someone on this street I'll call it street A, to purchase cable services with virgin, could I use outdoor wireless repeaters to bring their network to my street (street B)?
I was hoping to make this a street wide network where each household would pay a small fee towards the internet each month which would entitle them to a unique username and password which would allow them access to our street wide network.
Each household would be allocated a chunk of bandwidth from the total bandwidth of 152mbps. Each household will be allocated bandwidth based on how much internet they use.
So would this be possible? Will there be any legal issues and what process would I have to go through?