2nd generation HamWAN sites use MIMO modems. A MIMO modem and dish at the client site may improve speeds, but the single-chain 1st generation modem is still 100% compatible.
RB912UAG-5HPnD-OUT datasheet. The RB912UAG-5HPnD (board only, otherwise identical) is also recommended when paired with a shielded outdoor housing, like the RF Elements SBX-S-CC-2SMA.
Warning: These don't support 5 or 10 MHz channels, which are required for sectors and clients! This is the highest power MIMO radio we've seen from Mikrotik. RB921UAGS-5SHPacD-NM datasheet.