I'd rather use a Winegard HD7084P. The performance is well documented, Channel Master has dumbed down regarding the specifications published on their web site, offering a mileage rating is far less accurate than specifying gain referenced to a standard.
http://winegard.com/kbase/upload/HD7084P.pdf
All of this assumes WOCK, real channel 4 is a 'must have' station.
http://www.rabbitears.info/market.ph...n=WOCK#station
If you have no interest in WOCK programming, a Winegard HD7694 mounted at or above your second story roof peak would do quite well.
To distribute to six tuners, I would suggest an Antennas Direct CPA-19 and a passive 8-way splitter, terminate the unused ports with 75 ohm terminators.