I have a HD ready set and dish network. I am considering upgrading to the new HD reciever. I heard that to get the locals in HD. I have to buy a seperate antenna. Where do I get them?, how much should I pay?, are they easy to put up? And I live in Monmouth County NJ (about 50 miles from NYC)Would I get any reception from this distance? I am new to all this so layman explanations would be a big help. Thanks for any help!!!