I've covered 1,100 miles since my Redline was returned last week for an antenna repair. Initially I noticed it was not alerting in the usual way to the pair of K-band speed signs in my local neighborhood in Utah. The unit picked up the signs, but in both cases when it was about 300 yards closer than previous encounters. I sort of 'parked' that thought until more encounters. There is little to no K-band in open desert. Upon crossing into Nevada, there are a bunch of casinos in Wendover that the Redline always alerted to as I passed them on I-80. No alerts in Wendover. It seems the unit is not as sensitive as before, at least with K-band. It is difficult to establish Ka sensitivity at this point.
I'll chime in here again in a week after I log another 1,000 miles eastbound.