We actually took off from Oklahoma and was at altitude (12000) over Texas. Had a few contacts simplex 40 -50 miles away. I think some were skeptical we were airborne. I set it on scan when I wasn't too busy with other duties. Frequencies didn't appear too crowded but it was a weekday and it sounded like most on frequency were doing work related comms and not really concerned with chatting which I get. Keying up I was definitely getting repeater hits on all repeater channels for most of the flight. My feeling for SAR operations 1-5k agl would likely be the most affective. Lack of an external antenna was probably the biggest limiting factor.