5g internet fast on phone but slow on Computer

Move your gateway around your house.  The app told me to aim it towards one of the nearest towers.  I did and placed it near a window.  Download speeds weren't horrible, 100-220 mbps.  Uploads were around 20 mbps.  Pings were around 50.  Not bad, but I was considering purchasing an external antenna from Waveform and decided to check values around my house.  Moved the gateway to another bedroom that didn't have an accessible window.  Aimed it in the general direction of the tower, but through a wall.  The main screen shows excellent signal, but my 5g specs are only good to poor.  But now I'm getting 400-500 mbps downloads, 80-100 mbps uploads and pings 20-30.  Can only imagine what I'd be getting with an outside mounted antenna.