As shown on this page from our database...
https://www.radioreference.com/apps/db/?ctid=2872
Loudoun county is on a Phase 2 system that the 96 can't handle. If you go down to the very bottom, you will find all the trunk systems in the area listed there. If that is what you want to hear, a new scanner is in order. I would go to our Virginia forum and ask some questions there about what scanners will work best on such a system. Local scannists are always a better resource for this kind of information.
Just to give you some ideas as to what models will trunk that system, go to section 1.3.2 of the following...
https://wiki.radioreference.com/index.php/APCO_Project_25
Just click on the section number in the table of contents and you will be taken there. Good luck...Mike