I used to use the Antenna Specialist MON series of base and mobile scanner antennas. Yes, they worked great. I used the base version-I don't remember the exact model number, it was MON something, and it had 65" long radials- as my primary base scanner antenna for years. It worked great. The mobile version was like over four feet long, but it was hard to beat especially for VHF low band.
They're getting hard to find anymore. I believe even Scanners Unlimited stopped selling them. I did find one on the 'net, the price was over a hundred dollars!