I was using a tram multi-band mini mag mount
https://www.amazon.com/1089-BNC-Mini-Magnet-800mhz-1-BNC-Male-Connector/dp/B01DY8FOK0
Unication g5 will do a better because its only has two bands better filtering its drawback it does very little for the money its good if you only need to monitor one two systems i almost bought one just before SDS100 came out.. with SDS100 i have no problem with any system so far and lot more features like DMR
and as to directional in middlesex boro i think the FCC rule for 700 mhz county systems is you have to kept the most of signal within 5 miles of your border, this is why they are using directional antennas so you may not get a signal much more than 5 miles without without using a hi gain antenna