There was a LTR system on 440MHz ham frequencies over a decade ago, maybe two.
Three sites with overlapping coverage, 1 or 2 systems per site.?
It lasted a few years, then faded away.
There's still a large UHF commercial LTR system running in this area.?
No linking between sites, just 7 somewhat overlapping islands of coverage, 4 to 7 channels per site.
LTR has the advantage that the controllers are CHEAP...?
At one point I could have had a half dozen Tridents for hauling them away.
The Trident, Zetron and CSI units are common and interface to the repeaters very similarly.
UHF mobiles are cheap as well... M1225s and the similar Kenwood and Icom models are very common.
Mike WA6ILQ