I am replacing my radio antenna. On another post someone mentioned that the antenna can be either manual or vacuum. I assume vacuum means in theory it should telescope and raise to full length when you turn the radio on? And my second question to start with is, someone mentioned that a 1955-1959 Chevrolet truck antenna is a close match to go on a 1951 Kaiser Deluxe. Is that correct, or what antenna looks and functions most like the original? I'll try to add a picture of what mine looks like with the earlier antenna dropped down in the fender hole, my radio, and the 1958 chev truck antenna I found online, haven't bought just yet. Most of the ones I see online don't show a length. I'd like to find an automatic vacuum-raising 93-inch mast similar to the longer original manual-raising mast that was mentioned. Any recommendations are appreciated!