How Do I Increase Transmit Power to Extend My Range?
The transmit power on the AP is not the issue. Increasing the transmit power will give you a stronger signal on the client and make you think you have extra range, but the client itself is still transmitting with the same power, limiting the effective range. Additionally, turning up the transmit power increases the background noise and your signal starts to bleed into the neighboring channels, decreasing the range and throughput of any other APs in the area. The best solution is to get a better set of antennas.