Mclennan county helicopter frequencies

[BobCrk]

I live in Waco TX with two hospitals here. I just recently purchased a SDS200 and got my favorites set up, everything is working great. I included the Medivac module for Hillsboro and Temple and Killeen none for Waco . I am not receiving any transmissions , any suggestions to pick these up, maybe scrambled?
Thanks
Bob C
Hillsboro 151.4000
Killeen 160.170
Temple 152.307500