Fig. 5

a–b: Range-test results observed (a) and modeled (b) for hemi-directional receivers. All receiver positions are at the center of these plots and all the compass bearings relative to the shroud [shown in orange in (a)] were standardized such that they were theoretically blocking incoming transmissions from the south [hemisphere with gray slashing in (a)]. a Point locations represent range-test sites according to transmitter distance (m) and direction from the receivers. Range-test sites were then gray scaled by the number of possible transmissions actually detected with darker shades denoting more detections. b Modeled probability of detection