Antron 99 SWR problems - help me with this strange set up
 

I bought a used A99 a figured I would give it to my brother to put up
in his attic. so he monted the antenna on a PVC mast that he made in
the 20' tall attic. It was a 1.5 (SWR) 1 & 40. My father decided to
play with it and now it is showing infinity on both 1 & 40 turning the
rings changes little it never drops below 3.0. can someone tell me the
correct way to tune the antenna (this way I can make sure I am doing
everything right) also does the antenna need to be grounded by anything
other then coax (ie a ground strap to cold water pipe or something
alont them lines)... please help