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Tv antennas Are Not a Special Case.

Lightning Does Not seek out antennas.

There are also metal vent pipes that stick up out of the roof , lightning does not seek those out.

There are also Big air conditioners that are on roofs , lightning does not seek those out.

That said it is a good idea to ground the antenna mount and use a coax grounding block.

This grounding directs the build up of atmospheric electric static to ground.