We demonstrate the spectrum-monitoring capabilities of Sitara, a portable, compact, narrow-band software-defined radio (SDR). We developed Sitara as a platform targeting large-scale participant experiments in crowdsensing and general spectrum measurement. As such, Sitara fills a niche between fully-featured off-the-shelf solutions like the USRP products and the more cost-effective but tethered options in the RTL-SDR family of devices. Sitara is capable of transmitting and receiving common waveforms or capturing raw IQ samples for further processing. A mobile application interfaces with the Sitara over Bluetooth 5 for control and collection of measurement data during experiments. Sitara operates in standalone mode, controlled locally by a user or as a remotely-managed node, controlled by our cloud-based framework. Here we demonstrate operation of the Sitara in both these functions in a spectrum monitoring scenario.