My new R8600 is sitting next to a Homepartol 1 scanning Ham frequencies. The Homepatrol will stop on on all Ham transmissions, then tuning the R8600 to that frequency, the R8600 acts like no antenna is connected. one specific frequency is 447.100. Picking up on the Homepatrol (and other scanners) but nothing on the r8600. What am I doing wrong? I am ready to send it back. All connections verified and tested.