muzzle_blast, welcome to the forum, your pop gave you good advice,
the vector 4000 is an inexpensively constructed antenna using the same principles of operation as the sigma4,
in my experience the old so called 7/8wave vector 4000 performs better than the sigma4 when tuned correctly,
i can't say if the updates sirio have done to the new vector match their claim of an improved lower radiation angle,
the principles they have used are known if you look beyond the "big dummys guide to cb radio"
sirio are not near the quality of the avanti sigma antennas,
sigmas used 6061-t6 drawn tube with a .058" wall, sirio use less expensive and thinner 6063-t832 tube in metric sizes with about .049" wall in the radial sleeve and upper sections,
some say the vector is the best bang per buck out there, thats not true,
the vector tuned right is the best bang cb vertical at any price available today
