[AFMUG] -48v radio on same tower with +48v radio

[Craig Baird]

I have a terrible time wrapping my head around -48vdc.  I'm hoping you  
guys can help.  I've got a Cambium PTP820S that I'm going to be  
putting on the same tower with several Mimosa B5s.  The 820S is  
apparently -48vdc, while it appears the Mimosa is +48vdc.  I'd like to  
power both with a Meanwell AD-155C with a 48v battery string.  So...  
what are my implications here?  Will having both -48 and +48 radios on  
the same tower, coming from the same power supply end up shorting  
through the tower?  What's the best way to do this short of using two  
separate power supplies and battery strings?

Thanks!
Craig