[TowerTalk] Grounding Question - Rooftops

[Cedrick 'Fred' Johnson - WT2P]

Howdy-

I've just purchased a bunch of stuff to get started building an antenna 
system here on my rooftop in Brooklyn. Previous to being here in NYC, I 
was in IL, where I had a rather complete grounded setup (radials 
underground, copper grounding pipes at coax entry and at the antenna 
base, even access inside the house to ground on cold water pipes).... - 
here in NY, being on the top floor (4), with the current configuration, 
i'd be lucky to even get close to a cold water pipe. Any suggestions for 
dealing with "high altitude" grounding and lightning arrestors on the 
coax feeds?

Antennas: tribander beam, vertical ant, 2m/440 vertical.

Terrain: I'm not the highest structure around within 1 mile, but on my 
block, I am the highest point, which concerns me when we start talking 
about thunderstorms.

Any feedback and advice would be most appreciated..

WT2P