Since I'm at work I can't get any pictures, but it is easy enough to describe.

I bought a section of brass tubing at my LHS that was large enough for the emitter, cut about 1/2 inch off of the end and painted that section the same color as my tank. After I drilled out the hole in the mantle so the tube would fit, it stuck it in the hole and use CA to keep it there.

After some discussion on this forum about the effects of too much of the emitter sticking out and how I could accidentally shoot my compadres, I slipped the LED bulb in there and started testing. I found that if I pushed the bulb through the mantle and out past the end of the tube, the LED would send a very wide signal (like a shotgun blast) and nail any receiver in front of it (other than a tank to the left of the barrel, of course). However, that included friendly tanks, too. []

If I pulled the bulb backward into the tube so that it could not be seen very well, the signal seemed to be much more concentrated and only shot straight out the end of the brass tube (like a sniper rifle).

What I need to do now is install a servo and rod system that will allow me to change the position of the bulb inside the tube on the fly. Then, I can change the span of my shots in a battle and select what I need for each opportunity that arises.

Jason