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(168Km, not 161, but why is limited to 161Km the link calculator?....
)
For cable must be used LMR900 or better, not the LMR400.
RB911-5Hn: 23dBm @ 6Mbps,
RB911-5HnD: 26dBm @ 6Mbps SINGLE CHAIN,
RB911G-5HPnD: 30dBm @ 6Mbps SINGLE CHAIN,
@ 24Mbps (minimum for obtain 20Mbps, as required) the power are 17dBm SINGLE CHAIN,
if you use RB with both chain active, the power decrease.
You have considered Fresnel? 1468m mountain @ 75,2Km broken "lens"...
And not forget: in some country you can not transmit over 1W EIRP...
With that power, you never reach the distance...