https://www.aareff.com/en/2-stacked-dipole-fm-transmitter-antenna.htm

This can be minimsed to virtually zero by mounting the dipoles in a specific way.

A 30 degree protection zone from lightning strikes can be formed. To do this the mast, tower or pole should be higher than the dipole clamped to it. Using our dipoles the 30 deg protection zone is formed when the distance between the top dipole boom and the top of the mast, tower or pole is a minimum of 2 metres. If this distance is made greater than 2 metres by lowering the top dipole, then even further protection will be formed.

If at all possible it is also a good idea to drive a copper earthing “spike” into the ground by up to a 1 metre if possible. Then bolt this firmly via thick earthing cable with stainless steel or brass screws to the bottom of the mast, tower or pole.