I have a Pro-433 base and a handheld PSR-100 and the base has so much better reception. Why is this? I've tried better antennas on the PSR-100 and the pro-433 base still blows it away. I turn them both on and sit them side by side and the base picks up all kinds of stuff while the handheld just searches quietly away. Both radios have the exact frequencies programed into them. I just don't understand why there would be so much difference in performance between the two scanners. Can someone please explain...?