I have already 3 M+ rovers, and I’m using one as a base station.
I would like to buy an M2 in order to get faster fixes. I would like to know whether I need to buy a multiband base station in order to benefit from the M2 multiband capabilities.
In addition, is the M2 supposed to work with any generic multiband antenna?
Reach M2 requires multi-band corrections. That’s why Reach M2 and Reach M+ are compatible only in one way: Reach M2 as a base and Reach M+ as a rover.
Still, you won’t get the advantages of a multi-frequency receiver with such a setup.
Regarding your second question, M2 is equipped with an MCX antenna connector, so the antenna should be compatible with this connector type. In addition, it needs to support the following signals: