antenna, 2) an amplifier and comparison switching module, and 3) an analog-to-digital conversion and storage unit. The antenna, shown in Figure \[f\_edges\_photos\], is a “fat” dipole-based design derived from the four-point antenna of [@fourpoint1; @fourpoint2]. The design was chosen for its simplicity and its relatively broad frequency response that spans approximately an octave. The response of the antenna was tuned to 100 to 200 MHz by careful selection of the dipole dimensions. In order to eliminate reflections from the ground and to reduce gain toward the horizon, the antenna is placed over a conducting mesh that rests directly on the ground. The mesh is constructed from thin, perforated metal sheets to reduce weight and is shaped to match an octagonal support structure below the ground screen. The diameter of this ground screen is approximately 2 m.

Although the antenna is constructed with perpendicular dipoles capable of receiving dual linear polarizations, only one polarization of the crossed-dipole is sampled by the receiver in order to reduce the cost of the system. This is acceptable since the spatially averaged all-sky spectrum is expected to have essentially no polarized component. The Galactic foreground does exhibit strong polarization in certain regions, such as the 