The results of a comprehensive mesurement program at 820 MHz designed to determine propagation characterstics in flat suburban terrain are presented. The data are organized to separate the effects of surface features, mobile antenna gain, and land-site antenna height, gain, and type (omnidirective and directive). The data have been collected using a digital data acquisition system to sample each of 18 variables once every three milliseconds. The mobile traveled over 500 route miles in the suburban Philadelphia/Camden, NJ area while probing an 11-square-mile measurement area in collecting these data. The results show propagation characteristics and relative antenna comparisons in flat suburban terrain. These results are compared to earlier urban data and show an environmental advantage of 11 dB for flat open suburban terrain.