Monitoring In Southwest Nebraska

I periodically get over to southwest Nebraska from Denver and carry a GRE PSR-500 with me to monitor as I have time. I've got the usual public safety freqs programmed in for NSP conventional, the new P-25 VHF system I guess they've gone to and hear very little when out there. I realize there's little activity in the late evenings but are there some nets I should concentrate on when traveling out there? I only have the rubber duck on the radio since I'm in a company car but would like to see what i can hear... Thanks for any assistance.



I usually travel from Colorado along Hwy 34 to Mc Cook and return to Colorado when I'm out there.