There are a few more models available in the M2 series, most notably NanoStation, NanoBeam, and Rocket M2. Fortunately all are designed to operate in both PtP and PtMP modes. One unique feature of the M2 series is that they can operate as a standard WiFi access point/subscriber - allowing operation as a high performance WiFi access point, or long range WiFi receiver.
While both have a 4W EIRP limitation imposed by the ACMA, 2.4GHz offers better range and penetration than 5.8GHz due to the lower frequency. The downside however is that 2.4GHz is used by almost all WiFi, Bluetooth, some cordless phones, and a multitude of other class licensed equipment. The 2.4GHz band (2.4000 to 2.4835GHz) channel arrangement permits only 3 non-overlapping 20MHz channels 1, 6, and 11. Compare this to the 5.8GHz band which sports 4 non-overlapping 20MHz channels at the full 4W EIRP (5725-5850MHz), another 7 channels at 1W EIRP (5470-5600 + 5650-5725MHz), and then 11 indoor channels at 200mW EIRP (5150-5350MHz).
For this reason we rarely suggest using 2.4GHz in a PtP or PtMP configuration, with the exception of outback areas and other low density applications, particularly if WiFi access points are going to be installed at either end.
Outside of WiFi applications, use M2 equipment with extreme caution.
We’re often asked how 2.4GHz is impacted by rain. Rainfade does not substantially impact transmissions below 6GHz. However in near-LOS links, such as those penetrating through small amounts of vegetation, precipitation on foliage will cause the perceived density of vegetation to rise dramatically and consequently impact signal strength. While 2.4GHz can successfully penetrate low density vegetation please be mindful of how your link may perform during and after wet weather.