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I made this because I was having trouble keeping my antennas well separated from the frame of my quadcopters. This R/C receiver diversity block was specifically made for my R6208 SB Futaba receivers, but it is wide enough to accept a slightly larger FrSky TRF8SB. Keeps antennas at ideal 90 degree orientation from one another. In the printing process I find that the antenna holes shrink some so they will require reaming for a snug fit with standard antenna tubes.