Why is my brother's network stable and better than mine?

While my cmd gives these results upon sending a ping to :
my brother's gives good results of stable 10ms with no ping spikes, ever:
(I checked whenever I get ping spikes if my brother got these too, and he had good and stable connection while I didn't)
His room is a bit closer than mine to the router (by like 5meters), he has an antenna
while I'm using this:
we both have this sign:
as our network connection symbol

1) Why is his network connection better than mine? I constantly get ping spikes while his connection is perfect, 2) is there any way of making my connection better than his or at least the same? 3) is there any program that will make my PC be favoured upon dividing the connection speed? 4) If my PC will be connected to the router with a wire and I will be the "host" of our connection, me and my brother will have the same connection stability, right?
And one last question, 5) is there such a thing as a PC not being able to connect to a network wirelessly and being able to get network connection only by having it connected to a router? because my father's PC is pretty old and he says his computer can't get connection if it will try to get connection wirelessly. And if such thing exists, 6) is there a way to make it somehow be able to observe wirelessly the connection? like by adding special usb cable that will allow the PC to connect to an antenna.

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Figuring out why would require too much gear.

However I will share some tricks or settings I use on unstable WiFi. First I change the router to use WPA2 exclusively. Another test and if that didn't help we move to 802.11g since 54 megabit is far more than most internet connections.

But that said, anytime you share WiFi it will be subject to interference. That is, a ping spike is NORMAL if a long packet or string of packets is fetched. Just try to stream Netflix over WiFi and game. Fix? Get wired.

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Well there are alot of things that factor in

Router speed. the walls between you router and PC. You updated drivers on the PC. Your ISP versus his. DSL is typically slower then cable but cable is shared with neighbors. It's funny because i vacation to Ohio in the summers to my sisters and they have Time Warner Cable (Road Runner). They advertise 30 MB as high speed. In Central Florida we have Bright House Road runner and 30 MB is the slowest speed you can get and they also have 90, 150 and 300 MB (Which ia 199/Month).

You can also ping your router to see how fast you connection is.
Google ping

Ping is a typical IP address for a router but it may vary so you would have to check you router documentation.

Here's a test for you to compare speeds.

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