Yeap, this is 50. I get 6.2 MB/s (max) download and 5.5 average.
There's no reciprocal relation between my specific area connection with yours, so I didn't find it useful to post information other than SNR and attenuation.
This works for me in my area. Your mileage may vary. There are no guarantees it'll be the same for you.
I think load, equipment/hardware infrastructure, policy etc matter when it comes to different areas(provinces/cities).