You can add multiple sites into one knob position,
that doesn't mean program in all the control channels it means entering each site as shown below, and when you lose signal strength from one tower it will switch. HOWEVER, just because you travel from one part of the county to the next does NOT mean signal strength of the first site will drop significantly, allowing the pager to change sites.
I live 2 miles from one site and 15 miles from another, but the site 15 miles away is still strong enough to lock on as the stronger site, likewise, as I go to the next county west of the site 15 miles away it stays locked on to that site, not the new county's site. So, it is better to ensure both sites are on different knobs to ensure you hear the traffic you want. Tower assignments for units are NOT always the tower your pager will choose to monitor.
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