SmartZone is limited 10 sites, 11 using some trickery. Astro Core M allows for more sites. The new Montgomery and Anne Arundel systems are supposedly to have 20+ sites. I guess we will find out.I'm really surprised that its possible to efficiently simulcast from so many sites. I know at one point, there was a soft limit to the number of simulcasting sites in 800mhz (I believe it was 10). I wonder if linear simulcast technology is what changed it.
Baltimore County's two-site set-up seemed strange (not the concept, but the logistics). The north-site-only site-trunking talk groups were never "exercised" and a site-trunking situation would've likely been disastrous.