222DBFL

I mounted the antenna as suggested with a combination of a 25" and 10" shaft, and tried several different size whips (36", 48" and the original) on the Sirio 5000. I had no success getting the SWR's below 2.5. I went back to the 5 ft Firestick and the SWR's dropped to 1.3 across all channels.

I did purchase the Galaxy DX98VHP and cheched the SWR's and they were 1.3 on the lowest channel and 1.1 on the highest.

I will be getting my Tech license for use with this radio. Used it yesterday for the first time on the CB band and am impressed with the radio.

Again thanks for the input. It may just be this particular truck, as I've talked to other drivers using different antennas and they had success. I talked to Walcott CB Shop about the Predator 10k vs the Firestick and they said there would be no noticeable difference in performance.

I will have a couple of antenna options should my company purchase different trucks.