$50 radio 5km out to sea?!!

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Yes, but not really practical past 4km.
Gear used:
FS-i6X radio (Banggood):
Telemetry radios (Banggood):
VTX antenna (Banggood):
VTX (Banggood):
GPS module (Banggood):
Helical antenna (Banggood): (ymmv...)
FPV monitor (Banggood):
LiPo battery (HobbyKing):
Mini-talon plane (Banggood):
The 900MHz antenna on the ground station is one that I got with the u-blox RTK development set, I don't know where you can buy them.
The 900MHz antenna on the plane is this, but seems to be discontinued (HobbyKing):
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