Girdnerg is correct. The simplest way to make the connection to the antenna is to run coax cable from the antenna to the satellite receivers. If you try to use the satellite cables, you have to use a diplexer on each end. Splitters will not work. Your 722 has two satellite inputs, one for each tuner. There are either two cables going into the receiver or a single cable connected with a Dish seperator. I'm not sure how to use diplexers with that setup. You can ask that question in the Dish 722 forum at dbstalk.com.
If you use the direct antenna connection method, you can use high bandwidth splitters to send the ota signal to more than one tv/receiver. You can also split the signal to send it to a receiver and directly to an HD tv. I do it that way because I can record one ota channel on the DVR and watch a different channel on the tv. Your 722 only has one ota tuner. I've also had problems trying to watch an ota channel through the receiver when we lose satellite signal because of a storm. The ota tuner in your tv may be better than the one in the 722 allowing you to receive more channels. The Vip series receivers do not tune ota as well as the 811s did.
Be aware that if you want the channel guide on the satellite receivers to display program information, Dish requires you to pay for locals. The technology exists to display the information without a locals subscription, but they make you pay.
Compared to analog, Hd ota signals can be finicky. Every time you use a splitter there is some signal loss that can affect the tv or receiver's ability to tune a particular channel. Use good coax cable and splitters. I use RG6 quad shield and a powered cable/ota signal amplifer/splitter connected to the coax after it enters the house.
Good luck and be patient setting this up. It can be frustrating.