Links for HotSpot Discussion
Example eBay seller: https://www.ebay.com/itm/2018-Antenna-Case-OLED-MMDVM-Hotspot-Support-P25-DMR-YSF-for-Raspberry-pi/183098690667?epid=22021349476&hash=item2aa1884c6b:g:f~cAAOSwQp5alVPb
Setup guide: http://www.hagensieker.com/blog/page/?post_id=99&title=jumbospot-dmr-hotspot
PiStar: https://www.pistar.uk/index.php