[TowerTalk] Metal Roof

[Gilbert Kauffmann]

I live on top of Niles Hill  about 2,300 ASL  and the winds is unbelievable high...
I lost part of my shingle roof twice and the insurance company dropped me.....
Now, I have a metal roof, fantastic, no problem with 60 mph winds.....

However, I have a 40 ft tower with a 2 meter repeater antenna.....It seems that the metal 
roof interferes with the 2 meter repeater....  Also, my 160 meter OCF pattern has changed
a bit toward Northeast....
As a summer project I have help to erect 2 towers  40 and 50 ft,  If more time 89 ft Self support....
antennas,  M2 3 el 40 yagi....Mosley TA34XL,......2 stacked 105CAS....M2 6M7JHC

Does anyone know how to figure how far the towers should be away from the house ?? It seems
the metal roof  80 ft long has some interference of 2 meter and my  OCF dipole....

Tnx  de Skip  K3CC