Hi to everybody this is my first post, so if I make a wrong question let me know.

I have 3 clients connected to a hotspot at 5 Ghz, this clients use station wds, they have a "signal strength=-66" value, but when I make a bandwidth test, the result between the client and the antenna was 250Kb for download 250Kb for upload, those clients are at 500m of the hotspot and nothing block the view of the hotspot, i already check this, the tx/rx rate of those client are always 54Mbps, the speed between the site and the antenna isn't blocked, so the bandwidth test should be 20 Mbps or more, i went to those clients and their speed is lower than a dial-up connection. but I have other clients connected to this hotspot at 8 Km and their bandwidth test result is 5-6mbps.

I control the speed connection of each client in a radius, the 3 clients are limit to 1024kb for download and 256kb for upload. other clients are using this profiles without problem.

I hear any recommendations.

your clients are routerboards, or another equipament?

Yes all the clients have routerboards in their CPE and using ROS v 2.9.41 to .46