Patent ID: 7652626

Claim:
A co-linear direction-finding antenna, comprising: a reference antenna having a reference antenna base; a primary antenna that co-linearly opposes said reference antenna, said primary antenna having a primary antenna base; a dielectric sleeve is positioned around said primary antenna; said reference antenna and said primary antenna being supported and electrically separated by a ground plane orthogonally positioned therebetween; a transmission signal from a source at an unknown location generates a reference antenna radio frequency and a primary antenna radio frequency; said dielectric sleeve, having a predetermined thickness related to an azimuthal angle around said primary antenna, causes a delayed primary antenna frequency; and a means for detecting a time difference of arrival monitors and compares said reference antenna radio frequency and said delayed primary antenna radio frequency to establish a time of arrival delay of said delayed primary antenna frequency, provide an Angle of Arrival for said delayed primary antenna frequency and determine said unknown location, without emitting a detectable electronic signature.