The antenna that comes with that scanner is telescoping, so you can improve reception somewhat by adjusting the length of the antenna, that should reasonably well for the the Vhf-high frequencies used by Comal County.
New Braunfels is on this system:
Lower Colorado River Authority (LCRA) P25 Trunking System Profile
www.radioreference.com
Police talkgroups are encrypted, but you should be able to hear Fire & EMS.
That system uses 700 & 800MHz frequencies. An antenna such as this one would work better for that system:
REMTRONIX 800 MHz FLEX BNC Antenna
www.scannermaster.com
Some of your neighboring counties are also on the LCRA system, so an antenna as the one linked might enable you to receive at least some of their radio traffic, although an external antenna (roof top, or alternately attic mounted) would perform better for more distant sites. Note, though, that the antenna I linked is not a good choice for distant Vhf channels. It may do fine for your immediate area, but will be less effective on more distant Vhf transmit sites.