[BC] Temporary roof mount for STL dish

[Xmitters at aol.com]

Hello:

We are about to embark in an STL experiment here at NIU.

I have a 4 foot Anexter Mark grid dish that I want to place at the top of one 
of our buildings here. Since it's temporary, I need something that I can sit 
on the roof, not poke any holes,  that will hold the dish rigidly enough so 
movement will not affect our RF signal level experiments. 

What's out there that will do this?

Jeff Glass, BSEE CSRE
Chief Engineer
WNIU WNIJ
Northern Illinois University