For the last couple of years I've been using the Austin Ferret antenna, from Austin Antennas. I was very pleased with it even before I bought the HP-1. Since putting the HP-1 on it, I've received and verified transmissions 100+ miles away. I'm receiving the dispatches clearly, but, on long distance transmissions, am often losing the responses from the cars (not surprising since they're mobile). Before buying the HP-1 and connecting it to the Austin Ferret, I had one of my 396XTs on it. The antenna was excellent with the 396XT as well, but the 396XT doesn't come close to the HP-1's front end. The antenna is mounted on our roof, about 15' up. They're not one of the lesser expensive antennas, but they're worth every bit of what one pays for it!
Received the missing cable and missing hardware. The antenna was easy to mount and was up and running in about an hour. It is mounted about 20 feet above ground. My home sits about 1300 feet above sea level. It easily doubled my reception. The cable supplied is the RG 6 and is not very flexible.