Low output power (Engenius EOC2610)
Some versions of DD-WRT firmware reverse the primary and secondary antenna settings. In this case, the firmware assigns the "external antenna" as your primary antenna even if you don't have one attached. This can lead to extremely poor signal quality.
Change TX and RX Antennas to "Secondary".
Associate with the device and log into the DD-WRT control panel. Sputnik default IP is 192.168.180.1.
Under Wireless Settings, change the TX Antenna and RX Antenna from Primary to Secondary.
Then click Apply/Save Settings.