"ml" wrote in message
...
hi


a friend of mine might get permission to put up an antenna or two on top
of his apt building about 30 stories up mostly flat roof

the other buildings for a good distance are less than 6 stories

so i was wondering how do you protect something like that from
lightning

you don't. you add proper arresters and connect to the existing building
ground to handle the inevitable direct strokes. and don't do it on the
cheap or he may be liable for damage to lots of other stuff when the
lightning follows his transmission line into the otherwise safe building.