Deiermeier wrote

 

Since both can cover 5km they should be able to cover 150m with 30m beeing trees,right?

 

  @Deiermeier 

Not necessarily. The signal attenuation of dense materials (solid or liquid) is vastly higher than that of air. Don't expect the wireless signals to go through 30 meters of trees.
https://help.keenetic<dot>com/hc/en-us/articles/213968869-Wi-Fi-signal-attenuation-coefficients-when-passing-through-different-materials    (replace <dot> with .)

If the two buildings are not tall enough for mounting the CPEs high enough to allow for a direct line of sight between them, then you may have to consider errecting sufficiently long poles for mounting the CPEs.
 

  @woozle 

So i was mistaking 

On the satellite map it says 30m an from on top it also looks like it, but when there we found a gap where they're only 4 branches max blocking a line of sight.

We are still not sure which cpe would be better.

And since the source only has 50mbts, speed limitations shouldn't be a problem.