What stations do you want?
If you just need ABC, CBS, NBC, Fox, CW, MyN, ION and PBS from a single market then a HBU11 pointed at 338 degrees true would be all you need. That should easily do a 4 way split (up to 4 TV’s/DVR tuners) with at least 100’ of coax in the system without any amplifiers.
If you want multiple CBS/Fox’s for out of market football games then more design is needed.
With regards to your streaming box goals, I do not know of any good streaming boxes that have a robust DVR for OTA ATSC. I would recommend you consider a home theater PC with Windows Media Center (based on Windows 7). Netflix has great integration with WMC. WMC is an amazing DVR.
If you are willing to use separate boxs for DVR and streaming, and just need a DVR and don’t need program guide data, the iView 3500STBII is an inexpensive gem.
http://blog.solidsignal.com/content....I-Quick-Review If you use some sort of external DVR, I suggest you still feed antenna to your TV. Then the DVR can be recording one show while you use the TV’s tuner to watch another show.