Depends on the load it will carry which you failed to list.
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12 gauge underground wire or if you think you will ever add any devices to this circuit use 10 gauge.
Yes, it must have a standoff, and the proper service head in. I would run it underground instead of overhead. Use underground wire in a conduit.
Need to know what size service is going to be installed at the end of the run.
Comcast will install the wiring for you. They do not allow homeowners to run their own wire because they lose quality control. Typically Comcast will run a 1 inch conduit for underground installations. The wire most commonly used it RG-6 quad. comcast doesnt install conduits anymore because it was just too costly so it is upto the homeowner to have have that installed by a general contractor and then comcast will have pull in the new line for you.
You size wire by the current. Various insulations are rated for voltage, temperature and the medium where the wire will be run.