Here is a list of the 2 meter band. This came from ARRL.org 2 Meters (144-148 MHz) 144.00-144.05 EME (CW) 144.05-144.10 General CW and weak signals 144.10-144.20 EME and weak-signal SSB 144.200 National calling frequency 144.200-144.275 General SSB operation 144.275-144.300 Propagation beacons 144.30-144.50 New OSCAR subband 144.50-144.60 Linear translator inputs 144.60-144.90 FM repeater inputs 144.90-145.10 Weak signal and FM simplex (145.01,03,05,07,09 are widely used for packet) 145.10-145.20 Linear translator outputs 145.20-145.50 FM repeater outputs 145.50-145.80 Miscellaneous and experimental modes 145.80-146.00 OSCAR subband 146.01-146.37 Repeater inputs 146.40-146.58 Simplex 146.52 National Simplex Calling Frequency 146.61-146.97 Repeater outputs 147.00-147.39 Repeater outputs 147.42-147.57 Simplex 147.60-147.99 Repeater inputs Notes: The frequency 146.40 MHz is used in some areas as a repeater input. This band plan has been proposed by the ARRL VHF-UHF Advisory Committee. I'm trying to figure out which frequency to use with my BigRedBee 5 watt GPS without P/O anybody. I also want to stay away from the frequency that the repeaters may use. 144.390 MHz is the APRS frequency, but that may have too much traffic on it. The BigRedBee is capable of using any frequency in the 2 meter band. If I just listen to different channels on my radio (Kenwood TH-74A) and see which ones are quiet in Indiana, then I go to Kansas or Nevada to launch my rocket, things will be different over there. Also, what is NEW OSCAR subband? This OSCAR fellow likes to hog up a lot of bandwidth. How do you guys and gals determine which frequency is best without P/O anybody? Is that even possible?