The pro 106 is reband capable; it will not need a custom band plan entered.
fwiw, i can pick up sarpy county from Fremont with an 800mhz antenna. Not clear as day, but i can make out 100% of whats being said.
Being inside of a city (omaha) with paging towers and other things will have an impact though.
as stated above, make sure you have it set to "motorola 800/900" and have the following frequencies programmed in
0854.2625
0854.5375
0859.2375
0859.9875
Also, you will need all of the talkgroups you want to listen to programmed in, OR, have a "Wildcard" programmed in.