Hy guys!
It’s possible to do a link of 46 km over sea?
Setup:
2 x rb 433 with nstreme
2 x r52n mimo cards
2 x 31,5 dbi dual polarity dishes antenas
2 x towers 30 and 42 m
Image of link.
you do see the image that you posted yourself, right 
? if the link will establish, it will be pretty bad, as your fresnel zone is all in the water
What is the maximum throughput I can achieve with this link?
Adding to what normis said above, you need to clear the fresnel zone to have any chance of a “half decent” link.
Here is what that link will achieve in terms of rssi and snr margins… of course under ideal conditions. (low noise floor, good antenna alignment)
Distance ~28 miles (46km)
Free space loss -------------> 140db
Fresnel radius---------------> 79.17ft
Earth curvature ------------> 98ft
Required antenna height -------177.1ft
Rssi levels (same for both ends as equipment is the same)
Frequency 5805
EIRP —> 55dbm (whoa!, and assuming you have the card set at 24dbm output)
Expected rssi —> -54.8
Actual fade margin —> 41.2db
so… given you raise both antennas to the height indicated above your link should work flawlessly, although you’d probably have to turn down output power as the received signal on both ends would probably be too strong.
Thanks!