Try it with a hardware store brick or cinder block first. I say that after thinking that Larry's hole size is a bit small; I would go with 3/4" as 3/8" is a good fit with one RG-6. And I never think of running connectors through.

But I use this hole size in wood, where chips will occlude the hole slightly. In masonry, the hole won't have any brick splinters still attached to the inside wall of the hole, making the hole smaller.

By the way, you will find the block is easier to drill than the mortar or concrete fill, and the mortar or concrete fill are easier to drill than the rebar. Choose your hole locations accordingly, if you can see the block edges.