Devices, systems, and methods are described herein for communicating data using an adjustable software defined radio. In one aspect, an ultra-narrowband communication device may include a radio frequency (RF) element and a computing element communicatively coupled to the RF element. The computing element, which may include at least one processor and memory, may define a software defined radio. The memory of the computing element may store instructions, that when executed by the at least one processor, configure the communication device to at least one of transmit or receive data over at least two different ultra-narrowband channels using a first communication protocol. The software defined radio may be adjustable to operate at any of a variety of different ultra-narrowband channels responsive to a frequency band selection or allocation.