I found this thing at Fry's for about $60. It claims to shoot up to 50'. It comes with three glow in the dark darts and a reel with 10lb line. I haven't tried putting up an antenna yet, but it puts a pretty good dent in a cardboard box. I've had BB guns that wouldn't shoot through cardboard. You definitely don't want to try this thing on your dog! I'm sure it won't shoot a wire as high as my compound bow will, but it's a lot smaller and less conspicuous and easier to handle.
It only shoots UP about 20', which I guess makes sense when you think about it's 50' "range". It's a neat toy, but not that useful for hanging antennas.