Thanks for posting the TVFR link.
That appears to be a Winegard HD7082P. It appears to be intact, with only a small amount of sagging or bending of a few elements. If there are no other problems with it, it should be more than enogh antenna for the Milwaukee signals. Aimed at about 20° compass, you can remove the preamp and expect to have plenty of signal to drive a passive 4 or 8-way splitter. If you are going to connect three sets, use a 3-way splitter.
http://www.winegarddirect.com/pdf/spec_HD7080P.pdf
Actually, rather than saying 'can remove' I am inclined toward saying 'you really ought to remove the preamp'. You have so much signal power to work with, many preamps would overload, leaving with lower quality signal.