If you have a powered splitter/distribution amp. , You will not need a preamp. As a interesting experiment , put plain passive splitter in place of the powered splitter and see how the reception is on the tv's. . It's a big antenna and needs a strong stable mounting. I know the strong mounting is easy for you to understand and it is interesting to drive around and look at antennas on roofs and see the not so good ways that others have mounted antennas and some of the antennas have fell over.
http://www.solidsignal.com , and ,
http://www.starkelectronic.com , and ,
http://www.3starinc.com have antenna mounts.