No, the stock doesn’t make any difference. In fact, this antenna i have right now is a better performer than even the famous Remtronix. I will keep looking at other options. I appreciate all the feedback!
That's hard to determine if you're attempting to monitor systems that you're not in range of. No matter how many "other options" you find, you're not going to be able to monitor a majority of the systems you listed unless you're right on top of them.
The only one I can see is the Horizon Theraputics site, and not being familiar with the usage, it would "appear: it's only 3 talkgroups, and don't suspect you'll be able to determine if it's a data entry issue, or a programming issue until you set up a Favorite List, run a LCN Finder analyze session(s), and even double check if it's the correct Color Codes. The only way this could happen is if the scanner receives activity. Many of us have corrected errors in the database which can happen.
This is why I suggest going back to the stock antenna, make sure you're in range of Horizon, which despite it being close to your location, might not have the signal strength to reach you. It's all your choice on how you want to handle it, but currently it's not working.