2.4 vs 5.8 - PtMp and Backhaul

RouterOS Wireless Networking
1

Why would one use 2.4 vs 5.8 during a wireless network build. Is it because 5.8 has a smaller fresnel zone?

I am planning a network using RB 532 boards. I will use 5.8 for PtMp AP and Backhaul. Clients using 900Mhz and some clients using 5.8Mhz on RB112 for CPE. Can I locate the 900Mhz card and 5.8 cards (Ubiquiti SR9 and SR5 ) on the same board / enclosure?? Should I use 2.4? (Not planning on hotspots or mobility)

I would value someones input. The network I am planning runs on existing Silo’s / Grain Elevators in Rural Canada. To start we will only have a single Fibre feed (5Mbps) from a single point backhauling to a 100ft silo. From that Silo I will Peer to several other Silo’s for AP’s and so on.

2

2.4 less free space loss at, just one KM, it has a 7db advantage over 5.8.

At 1KM for example, to get the same “performance” you will need a 19dbi rather than a 12dbi panel. This leads to other problems. The 19dbi 5.8 has only 3 degrees to the left and right to be a strong signal. If the wind blows and the pole is way up in the air (because of the minor obstruction that 2.4 can blow through), you loose packets into outer space. (Same problem with those 24dbi 2.4ghz grid dishes).

3

5GHz links are much better than 2.4, fater, better ping, perfect.