I'm using the black Sierra Electronics antennas. I tried the splitter, but it reduced my AM reception a lot. The FM worked all right, and the CB signals were better than the Honda antenna. I took the splitter out, connected the AM/FM back to the right side, and the reception is pretty good. It picks the signal up off the base, since the right antenna is a dummy. It's not perfect, but still a little better for CB than the Honda antennas.