Installed the ELT antenna and the unit itself on previously installed shelf. The distance from the antenna to the side fuselage is limiting, but it fit in. But then the location of the antenna is inline with the coax connector on the unit. Again, very, very tight fit to get the antenna coax on without hitting the antenna base. Next time (?) I would place and install the unit BEFORE locating and drilling the antenna hole in the shelf. Although if you can't be good, be lucky.