The bomber would just fly under it or over it or he could fly around it and as soon as you move it you are back to tracking the target again.
And botching his approach, which I would consider being a success  

No, I'm not saying it's the best solution, or "all that I need" or that I can't imaging something better.  

   ( Actually I'm having an idea for 'realistic' (use that with caution) Flak gun batteries in the future.. especially on the Flak towers in the City  

 )
The focus is on 
quick and 
simple.
Also It would help me a lot in retaining some orientation when I'm in the gun.