https://www.rtl-sdr.com/sdrtrunk-setup-and-use-tutorial/ https://www.rtl-sdr.com/sdrtrunk-setup-and-use-tutorial/ there's things to "hear" trunked radios. also

https://www.rtl-sdr.com/sdrtrunk-setup-and-use-tutorial/ https://www.rtl-sdr.com/sdrtrunk-setup-and-use-tutorial/ there's things to "hear" trunked radios. also the "kraken" may be $700, but there was kerberosdr/hydrasdr which was much cheaper. Furthermore, trunking is usually done within the bandwidth of a typical SDR so it doesn't really obfuscate it as much as one would think. Also i bought one; not to find repeaters, but to find trolls who were using repeaters. I'd monitor the input frequency to the repeater, apparently the same as mitnick would. there were trunking scanners in the late 90s / early 2000s, as well. my neighbor had one.