Hi All Some time back I did do that same-upside down collinear-my theory was with the slight uptilt given to general collieas I tried it upside down and it worked very well. Loss of main RF radiation in the horizon is in essance the same as the majority of the radiation is from the first radiating element ie: the base of the collinea. The second theory is by using an antenna slightly off frequency that in itself will cause slight up-or-down tilt by a small degree. The good thing with mounting it upside down is that in "most "repeater installations there is always a less important direction that does not need full gain so the offset mounting becomes in your favour as in the case of stacked dipole arrays.
There is of course no harm in mounting two collinears via wilkonson divider -first in up right and the second on the upside down position. One thing I have always tried -time permitting and that is to test with a good 0dB gain antenna to get a good reference. regards Bradley ZS5WT --- John Everson <[EMAIL PROTECTED]> wrote: > --- In [email protected], Kevin > Custer <[EMAIL PROTECTED]> wrote: > > > I had excellent results with a Hustler G6-440 > (uhf) station antenna > side > > mounted and upside down on Mt. Davis (the highest > point in > Pennsylvania). > > Shadowing of the tower was no different than when > it was mounted > > upright, just better coverage down in the valleys. > > > > Kevin Custer > > 443.725+ Mt. Davis PA. > > In the past I have wondered if anyone has ever tried > to do this with > one antenna mounted upside down and another mounted > right side up, one > directly above the other, and fed in phase? > Interesting, No? > > Comments appreciated. > > John ab6li > > > > > > > Yahoo! Groups Links > > > [EMAIL PROTECTED] > > > __________________________________ Do you Yahoo!? Yahoo! Finance Tax Center - File online. File on time. http://taxes.yahoo.com/filing.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
