I ran my mains in 3" PVC and the internet cable two feet above that in 1.25 PVC. The power company had a 150 foot limit for underground service. Mine is about 149 feet. We haven't had any problems with the coax.
You need to consider the sweep elbows at each end of the 3" conduit. The 4-0 mains cable went into the first elbow fine but was extremely difficult to pull through the second elbow. They had to separate the second elbow from the pipe to get the wire out.
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