[Towertalk] Transfer switch

[n4zr@contesting.com (Pete Smith)]

I want to be able to switch two feedlines to two radios in a foolproof 
fashion, such that I can instantly put my second radio on the first radio's 
antennas, or vice versa, and not risk feeding the output from Radio A into 
Radio B (moan...).  What's the best (and hopefully fairly cheap) way to do 
this?  I know I could use two TopTen A/B boxes, but was hoping for a 
mechanical solution or one that is a little less expensive.

73, Pete N4ZR
Sometimes a tower is just a tower