Even after trying out a 3dB antenna similar to the ones the users of this system use I still had trouble getting reception. So I tried a side by side comparison of both scanners. Turns out the one in the car could barely pick up anything on the control channels while my other one could hear them just fine in the areas where I had been losing reception. Using that scanner I had clear reception of the system all over the county.
Did you make sure the attenuator settings matched? Swap the antennas? Swap the positions of the scanners? (Making sure it is not an antenna issue, or a signal null at the antenna. )
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