To Circa, All Talk groups. 9170, 9173, wildcards just to name a few
The TG's you posted are listed in the RR database as being digital
not encrypted. But, that could have changed. Looking at the MARCS-IP Butler Simulcast Site, it's mostly encrypted.
One other note, since it's a Simulcast site it wouldn't be unusual for a scanner to receive (unencrypted) traffic garbled. With 15 towers covering that area, your scanner is most likely receiving signals from several towers. Each signal will arrive at a different time, which the scanner reproduces as garble.
A simple test you can try. Lay your scanner down on it's back. Point the antenna to the north, monitor for a few minutes. Is it better (less garbled) the same or worse. Then point the scanner in another direction (slightly east, 2 oclock) and repeat the process until you've found a direction with improved reception or you've gone a full circle back to north.
If you do find a direction where you can receive clear audio or even less garble, you then might consider getting a directional antenna (Yagi). There are also some (directional) desktop TV antenna's that actually do a decent job with Simulcast systems.
Goodluck, hope you find a solution that works for you.
