We measure sensitivity by driving the inputs to the RF summer through a signal splitting device that simulates the antenna. The input signal level is adjusted until the standard deviation of the bearing is approximately 5 degrees. This input level, after compensating for the loss in the signal splitter, then corresponds to the published sensitivity. The measured values will depend on the receiver used, and in our case, we use an Icom R8500 in the NBFM mode (15 KHz bandwidth). Typical values measured in the 150 MHz range are: