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BTDT.
Even with a directional on top of the school, you are probably under the radiation pattern of the omni. I went through this with a school that had an omni on a 150' tower across the street. Putting a directional on top of the school helped slightly, but the signal was so poor it did not help much.
If the omni is on the side of the tank, there is no point in having an omni, the tank is blocking half the signal pattern anyway. If it is on top, the tank is blocking you.
You can check on the signal with a spectrum analyzer (best idea for several reasons) or use NS with the SUPPORTED card and a directional to see if you have enough signal to work with.
Check the signal and use your results to push the ISP to install a directional aimed downward at the school.
MikeP
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Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote.
-- Benjamin Franklin, 1759
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