Insure they are set to broadcast at 100% power. Next is to try a USB wifi device in each laptop and see if the wifi speed is restored. If so, although a bit rare, then both internal wifi are dying.
Comcast 100/20 service. 2 laptops win 10 (1 year old), other win 7 (6 years old).
2500 sq ft house, built in 2004. had comcast since day 1 with no real issues.
Trying to give as much info as possible.
Last 3 weeks my wifi signal has been awful. 5 MB dl speed. I have tried it all. Finally had comcast come out. They told me the signal looks fine. My cable is good. So we broke it down piece by piece.
1. If either laptop is connected via cable to the modem my connection is great
2. if either laptop is connected via cable to the router connection is great.
3. wifi has been bad on both laptops.
He said its probably the router, but did some resets (which I had done) but suddenly i was getting 85 MB dl on wifi. He said if it stops working its the router. Sure enough a day later i was back to slow wifi.
So I bought a brand new router archer c7 which had amazing reviews. Got it installed and ready and still have 5 MB dl speed on wifi.
I took both routers over to my moms house and they both work fine with my laptops over at her house.
I have been able to have great wifi in my house in all rooms and even outside in the past.
Does anyone have any ideas?
Thank You

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic