What model number is that Tenda device? I would like to look it up. Also, to connect using a 2.4ghz device the sector you are connecting to would need to be 2.4ghz and those are not very commonly used on the WUG, to my knowledge most of the devices running are 5ghz.
https://wind.ctwug.za.net/index.php/nodes?node=15910 - click on 'List Topology to all AP nodes', this will give you a rough but by no means 100% accurate guide of where to scan to with the test kit. A full 360 degree scan is recommended.
I had a look at your Node on Wind now, you are extremely close to Node Euro (no sector up there yet unfortunately), the Administrator of this node is @Trojan, perhaps speak to a couple of your buddies to get some community funding together to get a sector put up there, I'm sure he won't mind.
Alternatively, book the test kit and post your scan results here.
Have a look at these devices when you get a chance:
1: https://scoop.co.za/mikrotik-omnitik-5ghz-11ac-poe-ap.html (5ghz Omni-Directional sector for clients to connect to)
2: https://scoop.co.za/mikrotik-light-head-grid-24-5dbi-dual-chain.html (Mikrotik 5ghz Antenna for getting you connected)
3: https://scoop.co.za/mikrotik-tripack-lhg5-24-5dbi-dual-chain.html (3x Mikrotik 5ghz Antennas in box for if you get friends to join, works out cheaer per unit.