[TowerTalk] Grounding near patio

[Craig Sande]

I'm making plans to install a self-supporting crank up tower at the inside angle of an L-shaped ranch home.  I have an adequate area to dig the hole for the base, but am not sure what is the the best way to ground the tower.  The tower will have the home's foundation surrounding 270 degrees of the tower and an old concrete patio surrounding the other 90 degrees.  I am planning to tile over the old patio at some point, so if I cause cosmetic damage to install ground radials/rods, it will eventually be covered up.

I was thinking of having a concrete cutter create slots leading to a round hole(s) for the ground radials and grounding rods.  The defect would then be covered with mortar prior to resurfacing the entire patio.  I'm just not sure how many radials and ground rods to install and what I can do for a ground towards the house (which surrounds the remaining 270 degrees).  Can I go through the foundation and try to install ground rods in the crawl space (temporary hole in flooring would be required), or is there another way to go that someone could suggest.

Thanks,

Craig, AE7I