Wireless transmitter to monitor

[wolt99]

In our church we put the songs up on a screen and on a monitor for the worship leader. Well the laptop we run from is in the balcony so we send the signal wirelessly to the monitor on the platform. The signal is weak because the screen will com ein and out and will jump around. It is a metal building. Is there high powered wireless transmitter that will work better or that is designed for a metal building. The distance from laptop to platform is about 75 feet. Any help would be greatly appreciated.

[OldMan64]

Since so much info is missing from the post, it may be of value to give:
1) method used to transmit to TV (also method TV uses to receive signal)
2) device being used to transmit signal to TV
Since the method being used is not given, would something like this help boost the signal to the TV?: http://www.amazon.com/Hawking-HiGain-Directional-Corner-Antenna/dp/B0000DIET2/ref=pd_cp_e_1
Put that on the transmitter, directed toward the TV. BTW: being inside a metal building should not effect the signal unless there are walls to go thru.