First, let me make you aware there is no such thing as a HD antenna. The regular antennas get stamped with HD and it is a slick marketing sale. I have some experience testing antennas and the best in my book is JERALD which is made now in CANADA. I have had one with a pre-amp for 11 years now and through a sustained wind of 85 miles per hour and thick ice and snow it still is the same shape as the day I put it up. Not even one broken element on it. And I paid $200 back then. Most dealers here don't like to sell them because it ships in 2 boxes. The next best antenna is a wineguard. In my case I pick up stations up to around 150 miles away and no I don't live on a mountain but half way down a large hill.
Location is a big factor and also as another mentioned a good pre-amp. I also would suggest a combination antenna as later some stations may go back to vhf or vice-versa (uhf). Good luck!