I know very little about setting up networks, so I would like to ask you all for advice. In my house I currently have a router that emits wifi signals at 2.4 GHz and 5Ghz. My router is placed at ground level and I have a couple of ethernet cables running through my house, all the way up to the attic. What I would prefer to do is to have some sort of access point in my attic, that is connected to the router through one of ethernetcables, that will function as ‘amplifier’ for my wifi.
What I saw online is that a repeater performs this job, but is usually presented as a device that picks up the wireless signal and amplifies that instead of signals coming from a wired connection. Can I set a repeater up in the way I described?
Yes, definitely. u/leewhat’s comment explains why you had trouble with the Mikrotik; a dedicated AP doesn’t have a router mode you need to disable, so all you have to do is specify the same SSID and your devices will take care of connecting to the one with the strongest signal.
Since you have a 3-level house you may find you need two APs. As you have discovered with your existing router, wifi signals are usually shaped like a squashed dome; they have a better range horizontally than vertically.