Metal Roof?

[ceastmen]

I'm mounting my antenna mast with an eave mount on my shop.
The shop has a metal roof, the antennas are on the front side of the shop and are not looking over the metal roof towards the transmitters.
The antennas have a direct LOS toward the transmitters any concerns with the metal roof behind the antennas?

Thanks in advance,
Charles

[Tower Guy]

Mount the antennas at least 3' above the roof. VHF antennas might need a bit more.