I don't think the original post relates to submarines or carbon fiber boats.


Isaac

900MHz & 2.4 GHz don't work well if the antenna is immersed, for example, video feed from submarine camera, or 2.4 used for control.
And 2.4 in a carbonfibre glider fuselage is unreliable as the carbon fibre attentuates the rf signal intended for the receiver

All 6 of my large boats use Spektrum radios. No issue. No need for an external antenna.

Just clearing up a point. I have a dozen Spectrum and Orange receivers already. I was just concerned about 2.4Ghz and blocking due to water and in hull installation. Do you run additional aerial or are the Spektrum, Orange and Lemons just fine without this?

Try Lemon and you wont go wrong !
6 channel for only £15.99 here:
https://www.ebay.co.uk/itm/134079968504

Hi John, I use Spektrum equipment, and the receivers I find best are, Spektrum AR6100e and for a cheaper one, from HobbyKing the Orange R615X works fine.

Cheers Pete😊

have you tried phoning CMB (Cornwall Model Boats) I find them really helpful