Airtronics/Sanwa are not very popular with the FE boat crowd here so I have no idea what their pros and cons are.
Spektrum had an issue with the RXs minimum voltage being rather high, so digital servos could pull the bec/rx battery voltage down low enough to switch the RX off, which combined with a very long reboot time on their older RXs was quite a problem. To get around this many companies sell "glitch buster" capacitors that plug into a spare channel on a RX and help to stabilise the voltage. I have no idea if Airtronics/Sanwa have a similarly high voltage floor, but most glitch buster caps are cheap enough to be worth a go.
Installation can effect range to a great extent, to maximise range get both aerials out of the hull as high as possible, and vertical, space them apart in width as much as is possible so you always have 1 on your side of the roostertail.
Water absorbs radio waves, whereas the ground reflects them, so the range being shorter on water than on land is perfectly normal for ALL radios. Having said that some radios do have a longer range than others, and that also translates to longer range over water.
I would normally say that my preferred brand is one that you never see this sort of post about, but in this case I have no idea how mine would perform at that range, even at our SAWs lake we can't get more than 200m away, and >90% of my boating is roundy round within 100m.
Paul Upton-Taylor, Greased Weasel Racing.
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