I have had a wilson 1000 and a wilson 5000, both roof mounts, and both failed in the exact same way.
I believe the weak point to be the solder connection between the base coil and the whip holder.
Both antennas would appear to work when the vehicle was sitting still, but would cut in and out when in motion.
verified by bending the antenna back and having the receive drop right out, only to return when the antenna was put upright again.
Both antennas were purchased within the last 10 years. the 5000 failed on me about two years ago, after being in use for about three years.
I now run a full size whip, but would not hesitate to try the sirio out, as i have tested one before and found them to be very nice antennas.
LC