Good question. For optimum radio performance, we have to stay within the FCC rules of max RF transmit power. Using a typical transceiver style IP radio (WiFi), the radio will be transmitting and receiving. The FCC will limit the amount of RF gain that can be used on transmitter antennae, but not on receivers. By using a transmitter and receiver setup, we can maximize the antenna gain on the TX to FCC limits and get much higher gain on the receiver antenna. Overall, this approach will provide much higher performing radio solution than the normal WiFi - as long as you can live with directional antennae.