Bill - it wouldn't work with a 2.4 set!!
The only reason I didn't lose it altogether was that, as it hit the water, the weight of the batteries upended it allowing me to grab the 3 ft aerial

With your stubby little thing (the aerial that is) you'd have to make sure you had a good hold and just dip it GENTLY into the sea until it was fully submerged

At least ours was accidental - I've seen a frustrated multi racer THROW his tranny into the lake when his boat was smashed up!
Hmm... now why did I pack up multi again ....

Danny