Sure would like the benefit of anyone's experience with something I've heard referred to as "passive repeaters" for VHF simplex communications. As described to me, the purpose was to channel some usable signal between two fixed points that are within normal FM simplex range, but totally shadowed from one another by the terrain. The method was to install two beams at a location that gets a good signal from both fixed points. With one beam aligned for max signal from one fixed point, and the second beam aligned for max signal from the other fixed point, connecting the driven elements with low transmission line allows simplex operation between the two (otherwise shadowed) fixed points. It sounds like a cheap, lightweight, and very simple method to fill RF dead spots when events like bicycle runs, walk-a-thons, and back road car rally's are conducted in very hilly terrain. On one hand, it sounds too good to be true. On the other hand, if simple communication is the goal - not a noise-free conversation - then even a scratchy signal is better than none. Although repeaters, cross-band repeaters, and simplex repeaters might also be used, they each may have some drawbacks under the described circumstances. A Google search yielded several hits suggesting that passive repeaters can work at microwave frequencies (however, most seemed to "aim" at stealing high speed Internet access). Other hits talked about less ambitious use of passive repeaters, like improving VHF signals inside metal buildings for pagers & hand-helds. Again, I'm hoping for the voices of experience here, not opinions. No matter what mode or bands were used, has anyone actually used, or tried to use, something like this "passive repeater" (regardless of what you called it), for simplex communication? What sort of results did you get? How did you set it up? What capabilities & limitations did you learn about when you put it to use? Did you learn some things that didn't work & should be avoided?