RTS-Threshold

Use this field to define the RTS threshold. If the size of the packets for transmission exceeds this value, the device uses the RTS/CTS protocol in order to prevent the increased probability of collisions and the associated "hidden station" phenomena.

Since the RTS packets are generally very short and the use of RTS/CTS increases the overhead, using this method only pays off if you are using longer data packets where collisions are likely. The best value can be found using trial and error tests on location.