You are correct. You only have to program the site closest to your locale. Regardless of the site you monitor, you will pick up all the activities on the system. Also, you only need the output frequencies, not the inputs to monitor any system.
Hope that helps you.
Uniden (2) BCD436HP/ BC450A/ ICOM IC-7600/ IC-R20/ IC-R3/ Sony ICF-2010
Radio Shack (2) PRO-651/ (2) PRO-164/ PRO-97/ PRO-404/ PRO-2026
SDR: NooElec NESDR Mini 2+/ NESDR XTR+/ RTL-SDR Blog
Last edited by u2brent; 02-21-2017 at 8:44 PM..