I'm trying to figure out the best path, other than drilling and the
time consuming process of fishing/drilling through floors, to get a RG6
cable and Cat5e cable from my attic to my basement.

I have heard that you can run plenium Cat5 down environmental vents
without any issues. The sewer vent runs from the attic to the basement
and is the only direct path I can see. The pipe is 2" and is used for
my sump pump in the basement. I was going to cut the pipe and use a 45
degree capped splitter for the wires in the basement to avoid drilling
ugly holes directly in the pipe.

Is this NOT a good idea? Any restrictions on if I can do this with RG6
or Cat5E?

I'm in Georgia, if that helps any in regards to code.

Thanks!

Tony