Fig.B. Red lines indicate sets of points (hyperbolas) where a bird may have been located when the indicated arrival time delay was documented. The blue vertical line represents the meteorological tower and the red circles the locations of the microphones. The axes are in units of feet. The range of the flowerpot microphone setup for detecting flight calls of most warblers and sparrows (and likely Least Flycatcher) on both channels is estimated to be less than 1000-ft vertically and less than 400-ft horizontally.