What Scanner Do I Need to Monitor StarCom21?
You need a digital capable scanner. Both Uniden and Radio Shack/GRE make these, but they do differ on what capabilities they have. Here is a list of the various digital scanners, and what each can do on SC21. There are no other scanners available that can monitor or track SC21 than those listed.
Radio Shack Pro-106 Click for Larger Image SRP (approx) $500 YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Reviews Link eBay Search Link Fire Tone Out No NAC Decode Yes GPS Abilities No? Rebanding Flash Yes Tower ID Hex Radio ID ? Discriminator Tap No PC Programming S Antenna    BNC Comments:  NEW, November 2008	Radio Shack Pro-197 Click for Larger Image SRP (approx) $500 YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Reviews Link eBay Search Link Fire Tone Out No NAC Decode Yes GPS Abilities No? Rebanding Flash Yes Tower ID Hex Radio ID ? Discriminator Tap No* PC Programming S Antenna    BNC Comments:  NEW, November 2008	Uniden BCD396XT Click for Larger Image SRP (approx) TBA YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Purchase Radio Link eBay Search Link Fire Tone Out Yes NAC Decode Yes GPS Abilities Yes Rebanding Flash Yes Tower ID Dec Radio ID Yes Discriminator Tap Yes PC Programming B Antenna    SMA Comments:  Announced 11/08; available first quarter 2009
GRE PSR-500 Click for Larger Image SRP (approx) $550 YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Purchase Radio Link eBay Search Link Fire Tone Out No NAC Decode Yes GPS Abilities No? Rebanding Flash Yes Tower ID Hex Radio ID ? Discriminator Tap Yes PC Programming S  Antenna   BNC Comments:	GRE PSR-600 Click for Larger Image SRP (approx) $550 YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Purchase Radio Link eBay Search Link Fire Tone Out No NAC Decode Yes GPS Abilities No Rebanding Flash Yes Tower ID Hex Radio ID ? Discriminator Tap Yes PC Programming S Antenna    BNC Comments:	Uniden BCD396T Click for Larger Image SRP (approx) $500 YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Purchase Radio Link eBay Search Link Fire Tone Out Yes NAC Decode No GPS Abilities No Rebanding Flash Yes Tower ID Dec Radio ID No Discriminator Tap Link PC Programming B *L Antenna    SMA Comments:
WiNRADiO   Click for Larger Image SRP (approx) Varies YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Purchase Radio Link eBay Search Link Fire Tone Out ? NAC Decode ? GPS Abilities ? Rebanding Flash ? Tower ID ? Radio ID ? Discrimator Tap ? PC Programming ?  Antenna   ? Comments:  WR-G305e   WR-G305i	Uniden BCD996T   Click for Larger Image SRP (approx) $ YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Purchase Radio Link eBay Search Link Fire Tone Out Yes NAC Decode ? GPS Abilities ? Rebanding Flash ? Tower ID ? Radio ID ? Discrimator Tap ? PC Programming B Antenna    SMA Comments:	Coming Soon! (Hopefully)   Click for Larger Image SRP (approx) $ YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Purchase Radio Link eBay Search Link Fire Tone Out ? NAC Decode ? GPS Abilities ? Rebanding Flash ? Tower ID ? Radio ID ? Discrimator Tap ? PC Programming ?  Antenna   ? Comments:
Programming Software - Key/Links B -- bcTool OR  Butel P -- PSR Edit   YahooGroup  S / W5 -- Win500 (Starrsoft)  YahooGroup A5  -- Arc500  YahooGroup ScanControl  Link ID Tracker II  Link Pro96com -- Link UniTrunker -- Link	Radio Shack Pro-2096 Click for Larger Image SRP (approx) $ YahooGroup Link MFR Webpage Link RR Wikipage Link Owners Manual Link Purchase Radio Link eBay Search Link Fire Tone Out No NAC Decode ? GPS Abilities ? Rebanding Flash ? Tower ID ? Radio ID ? Discrimator Tap ? PC Programming ? Antenna      Comments:  Discontinued, Sold out from Radio Shack online 1/09; may be available in store       Not recommended for Starcom21; can not track 700 Mhz sites, but can monitor with a mod.
	See RadioReference Wiki for a larger scope chart for comparing digital scanners  LINK