[TowerTalk] Anybody have any information about mounting a Diamond 510 or similar upside down?

[bobg at w2cyk.net]

I have mounted one of these upside down....anyone have any info on how 
this should work? 

I mounted one as such this weekend, but it is horribly deaf.  I sealed the 
bottom and created drain holes in the mounting tube.  It is fed with brand 
new Belden 9913, new connectors, and tests perfectly with an MFJ-269.

Thanks in advance....

Bob
W2CYK