Assume you want to protect your devices, not the sturcture itself. If you are 'structure' only... ground the thing maybe. BUT heres the real story. Big Old EMF field surrounds grounded mast & cable as impulse finds easy ground path. I know my cams and devices are NOT military hardened against such massive surges. Induced EMF takes out devices. EMF follows any cables into base units. But your beautiful mast may have only become discolored. During my career I repaired hundreds and hundreds of EMF damaged devices on mast, in structure, from 'grounded' installations. Why give the intense magnetic field an easier path to envelope your devices and cabling?Grounding mast DOES help with gradual charge build up, but not megagauss sudden impulses. Any Cabeling lies parallel to the current path down the mast and any 'ground' straps. Wireless devices are still subject to the impulse EMF field, and your low resistance ground is a welcome sign..."COME HERE!"