by introducing a different direction of arrival from the wireless device the phantom client may persist even with direction of arrival readings from two access points of course the more direction of arrival readings the clearer the line of sight 121 or 122 versus 123 and the less multipathing 131 33 the better the calculated location fix based on direction of arrival preferably in a wlan environment an access point with an antenna array is used capable of spatial separation among wireless clients as described in the related application that has been incorporated by reference determining direction of arrival for a radio signal is old so it is not necessary in this document to elaborate on determining the direction of arrival combining received signal strength with direction of arrival improves location fixing and helps eliminate phantom clients for instance using two access points 111 and 112 to distinguish between client 105 and phantom client 106 the received signal strength at access point 112 should readily distinguish between 105 and 106 because the actual client is twice as distant as the phantom client a third parameter that can be used to determine a location is time of flight for energy traveling from the client to the access points in one embodiment time of flight measurement can be based on a round trip from the access point to the wireless device the access point sends a packet such as a data or pool packet the wireless device immediately upon receiving the packet responds with an acknowledgement ack packet the time.