I've been waiting to see when the DCNR rangers at our local Presque Isle park would get the new P25 radios. I was there today and may have noticed a change in antennas on their vehicles. For years with OpenSky they just had a small black center-loaded antenna on each car. Today I saw they have added about a 2 foot silver antenna also on some cars. Not sure, but maybe this has to do with P25?
Could be. That antenna length would be about right for a quarter wavelength antenna used on the P25 VHF frequencies (153 MHz or so.)