I have hooked my other scanners up to the same antenna and did have improved performance. As for bypass, there's a selection on the Antenna tuner that allows bypassing the internal matching network. I haven't bothered trying to find a match ( impedance) on Airband as I figure it's too far out of the range of the tuner. ( VHF Airband)
What really impressed me was the scanning speed. It is much faster than my scanners. I really need to put up a dedicated antenna for my scanners. I am in south Fort Worth Texas and there is a lot of activity, especially to and from, Dallas International Airport. And several other smaller airports. Plus the Joint Reserve Base. ( formally Carswell Airforce Base)
Plus, a lot of broadcast stations. Some of which ( FM mostly) cause some interference. I have a filter coming today that hopefully will reduce or eliminate that.
James