Pleasant Hill, IA are associated with this frequency 856.0625, those are on the RACOM - IA, SD, MN, NE, IL, WI
RACOM - IA, SD, MN, NE, IL, WI - The RadioReference Wiki
which is an "EDACS" "System", they can't be monitored as "Conventional Channels" in any "Group"
They are to be programmed in as "EDACS System",
your local tower "Site" is Pleasant Hill and all "Edacs" associated frequencies.
Enter the frequencies and their LCN Logical Control Numbers (Logical Number Order) for Pleasant Hill, IA *Polk
09 854.31250 10 855.31250 11 858.31250 12 861.31250 13 858.71250 14 859.71250 22 856.06250 24 857.76250
LCN 09 for frequency 854.31250 LCN 10 for 855.31250 so on and so forth
Your "Groups" will consist of TGID's one might be TGID 1845 (TGID stand for Talk Group IDentification (Numbers)
and then you change it to the Name you prefer Ankeny PD DISP. (1845 A Ankeny Law 1 Police Dispatch (linked to 460.275)) the A stands for Analog, if there is a D you will need the a BCD436HP or BCD536Hp scanners with the $50 Pro-Voice Upgrade. Your BCD396Xt will only pick-up EDACS Analog
You can program in "Conventional" Frequencies into a "Convention System", then into a "Group" like these frequencies
Polk County, Iowa (IA) Scanner Frequencies and Radio Frequency Reference
but the good news and bad
is it looks like your local area is migrating to a system your current scanner should pickup part of, its called P1 (aka P25 P1 or Phase 1) but not P2 (Phase 2)(its actually abbreviatedPi & Pii) the bad news is it looks like your local area is will change all traffic to Phase 2 in the not to distant future and your scanner wont work for that and you will need a scanner with P2/Pii capabilites These Scanner will work in with P2 Uniden BCD436HP, BCD536HP, HP2, BCD325p2, and BCD996P2 o r GRE PSR-800, Radio Shack Pro-668, Whistler WS1080, WS1085, WS1095, WS1098 the GRE 800/Radio Shack Pro-668 and Whistler WS1080 and Whistler WS1088 are all very closely related save the 1088 has a key pad.
Central Iowa Regional Public Safety Communications System (CIRPSCS) Trunking System, Des Moines, Iowa - Scanner Frequencies And you can put this in the scanner as a P25 System
Concepts and idea's/beginners guide to Trunk Scanning
http://wiki.radioreference.com/images/c/c7/Trunking_description.pdf
Common Trunking Programming Questions - The RadioReference Wiki the last part in this article doesn't correctly identify which scanner can receive EDACS Provoice