I have monitored Illinois' StarCom21 system while mobile, and IMHO it is far and away superior to SAFE-T when listening on a scanner (PSR-500). IIRC, it was even this way before they rebanded. I swear the PSR-500 does a better job with a P25 control channel than it does with a Motorola control channel. Now that StarCom21 is rebanded, mobile monitoring is outstanding, even with just an 800 rubber duck inside the car. If you get out into an area where you're a good ways away from the nearest site, it can get a little rough, but overall it blows SAFE-T away. Intermod from nearby cellular or iDEN networks is not near as much of a problem as it was before rebanding. Hopefully we'll see the same change with SAFE-T.