Cisco1200 AP with 2 AIR-ANT3338 antennas

Recently I needed to cover a 200m x 400m area with wireless network, what I had is 1200 AP and two AIR-ANT3338 antennas.
I didn't have power source so I went to the POE technology as a power source for the AP
After the hardware installation the wireless Choosed channel 10.
But the wireless coverage was about 50% of the area.
My question is would POE as a power source affect the wireless signal range?
and there sould be any more configuration to do on the 1200 AP?
Thanks

My question is would POE as a power source affect the wireless signal range?
no

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I understand what you say, so to make it easier for you to provide me with a “possible” answer, I will inform you about the situation. And I hope that you will be able to help me.
We have already placed a local wireless network using the 1130AG cisco Access points. That Cisco as you know has a 2dBi omnidirectional internal antenna. We placed them outside of the buildings, inside of electrological boxes to protect them from the environmental changes. The walls that the signal has to penetrate are about 80cm of cement and stone. (pretty thick walls…)
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Cisco1200 AP with 2 AIR-ANT3338 antennas

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