Why not just get a wifi repeater and place it as close as possible to your room door?
Home Networking
A community to help people learn, install, set up or troubleshoot their home network equipment and solutions.
Rules
- Please stay on topic.
- Please use the search function to look for keywords related to what you want to ask before posting since most common issues have been answered.
- No Ads. This community is for support and discussion. Ads and self promotion are not welcome here.
- No product reviews or announcements. If you have a question about a product, be specific about what you want to know.
- Be civil. Don't be a jerk. Not being a jerk is surprisingly easy.
- No URL shorteners. URL shorteners tend to hide the real use of a link. For this reason, please use normal links, even if they're long.
- No affiliate links.
- No gatekeeping. With profession shall come professionalism. Extend help without judging others for their ignorance. The same goes for downvoting of comments or posts for "stupid questions" or not being as knowledgeable as others.
If your friend has an option to consult with others and check the wi-fi signal in their rooms (1-4) to figure out roughly where the most significant signal drop is.. Considering what you said about electrical status in that place..
Probably an AP in the spot B could help, but there might be a situation when AP in room 3 or 4 would help more — if your friend is planning to just buy it, I would just test it in those three spots to find what setup gives the best effect.
But, if there are more apartments in the building, all of them (assumption) with their own wi-fi — I would start tinkering with channels first to see if that would resolve the issue or at least boost the signal to any usable state.
I would place a wireless access point somewhere in the corridor, either in the ceiling outside your door or just on some table if there is one.
I know people will shit on me for saying this but setting up an old router (say an Asus ac68u or ac66u) in wireless repeater mode using the 5GHz band for backhaul works wonders when you don’t need super fast speeds. And you should still be able to get fast speeds (though higher latency) in your room.
I’ve done this and can still accomplish up to 300 Mbps with a relatively low latency. It all really depends on the circumstances (and especially the main router)