In accordance with one aspect of the present technology, information about multipath in an area is gained by occasionally switching the directivity of one or more of the involved antennas (transmitting or receiving). Based on resulting changes in signal strength, information about the multipath effects can be discerned, and corresponding action may thereafter be taken. Another aspect of the technology involves localizing sources of multipath by reference to multiple receiving stations, such as cellular receivers at cell towers in adjoining cells of a wireless network.