I have been using the Futaba set in my boats for over six months and have had no problems in either my power boats or Laser yacht. I tape the receiver just under the deck with the aerials along and across the hull. Keep them as high as possible and definitely above the waterline. Also, away from servos and other metal objects. The aerial is, in fact, just the last 30mm of bare wire with the rest a screened lead. As an added precaution set the fail safe to suit your boat.
My only complaint is the low capacity of the, as supplied, Nicad transmitter battery for the several hours I run my yacht. Recommend you fit a higher capacity NiMH battery. I hope you get as much trouble free running as I have had.
Fred