Here are some frequencies to get you started. Other frequencies local to your
area can be found in a scanner/radio guide.

152.03 - 152.24, .03 spacing
152.51 - 152.84, .03 spacing
158.10
158.70

454.025 - 454.650, .025 spacing

931.0125 - 931.0875 , .025 spacing
931.8875, 931.9125, and 931.9375 are the national channels.