Since the KCMO system appears to be a simulcast P-25 system, you're probably having issues with the digital simulcast distortion (
Simulcast digital distortion - The RadioReference Wiki) where too much signal from multiple towers is causing issues. Try things to reduce signal level (like the attenuator) or isolate your receiption from only a single tower using a very directional antenna like a yagi.
I understand that you've attempted to use multiple antennas and the attenuator. You might try something "stupid" like no antenna to see if that helps (that should reduce the signal to the absolute minimum possible) or at least tell you how much signal you're getting without any antenna. At times, I'm able to shield my antenna with my hand to reduce the mixing signals enough to get good receiption when traveling through a bad spot on my local system.
You might also want to check out this thread (
http://forums.radioreference.com/scanner-receiver-antennas/219524-cure-my-simulcast-distortion.html) and others linked to there to see what things you might do to help correct your issue. This is a very common issue with scanners (and even some actual radios).[/QUOTE
thanks for the input....my system has 4 CC... currently they appear to be using only one the best I can tell...I'm using the WildCard scanning option at this time because they keep adding new talkgroups in there new stage...Im wondering only two weeks old in there broadcast that they will tweek there system? as far as finding the closest tower I'm not sure how to find that out...if I take off the 800meg rubber duck I get no reception at all ..... simulcast systems I was not aware of there shortcomings on a scanner...I thought I had your run of mill P-25....thank you.....Mike