Total posts : 45366
If you look at the FCC Part 15 or Industry Canada RSS-210, the rules state that the length of the ground wire + radiator (feedline and antenna) must be less than 3 meters. I don’t see how an external ATU can be considered a transmitter under any stretch of the imagination – it does not generate any radio waves, but tunes the antenna for a better impedance match (so the waves don’t get reflected back to the transmitter). In other words, the feedline to the ATU, plus the ATU, must be considered to be within the 3 meter limitation. That’s why manufacturers such as Hamilton include a tuner as part of the transmitting unit, and place this unit at the base of a whip antenna. I’d like to know who these ‘people in the know’ are that you refer to…I’d take their advice with a very large grain of salt.