I went out and got an HD Radio when it first came out and I hated it. I couldn't pick up an HD signal from more then a few miles from the transmitters. I put that HD radio away and never touched it again. When I purchased my new car it had HD Radio built in (along with Sirius) and thats when I started playing with HD radio again, and I must say it has improved and I am a fan of it now.
I don't know what they changed, but I can listen to WDRC in HD almost into Springfield. I can pull in all the New Haven stations in HD here as well. And at nights I can sit in my driveway and listen to WFAN out of New York in HD as well. I don't know what they changed but it works good now.