Here's an SWR chart of the MFJ-1976 telescoping whip from a RigExpert AA-650 Zoom analyzer, with a 2 ft coax jumper between the feed point and the analyzer (i.e. no long coax in the measurement). The antenna is mounted on a 3/8x24 trucker's mirror mount on the rear ladder of the camper. There's a 1 inch braided ground strap running from the antenna mount to a frame bolt on the rear of the RV. Seems to do a good job resonating on 12 meters and 11 meters. I bring it down to 1:1 with a MFJ portable tuner near the radio.