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| Oo e FAGE NINE 7-855 © e a i i.e RE: CORRESPONDENCE DATED MARCH 10, 1974, WHEREIN VOICES ON TAPES MIGHT HAVE BEEN COPIED THROUGH THE OUTPUT FROM A RADIO RECEIVER: FBI LAB, AS WELL AS PERSONNEL OF THE SAN FRANCISCO OFFICE FAMILIAR WITH SUCH MATTERS, HAVE UNCOVERED NO EVIDENCE -To INDICATE THAT ANY OF THE TAPES RECEIVED TO DATE WERE MADE FROM A PADIO RECEIVER. IT SHOULD BE NOTED THAT IF SUCH WAS THE CASE, THE PROBLEM OF LOCATING A TRANSMITTING ANTENNA IN URBAN OR. REMOTE AREAS WITKIN A 200-MILE RADIUS OF SAN FRANCISCO WOULD RE MOWINENTAL. SUCH ANTENNAS COULD BE CONCEALED AND EVEN WITH THE ASSISTANCE OF THE FCC IN MONITORING DIFFERENT RADIO. FREQUENCIES WITH THE PURPOSE OF LOCATING A SIGNAL SOURCE, WE HAVE DETERMINED FROM REPRESENTATIVES OF THE FCC LOCALLY THAT SUCH A TASK WOULD BE PRACTICALLY IMPOSSIBLE, THAT THERE WOULD BE NO INDICATION OF THE TIME TRANSMITTED, FREQUENCY, of TRANSHISSION OUTPUT. | RE: GRID SEARCHES IN EFFORT TO LOCATE SITE WHERE VICTIM MAY BE HELD: - END PAGE NINE o> A A i OT yal hey At haa Le ale es a < he Antar st