Bad wireless connection in one room of house?

So my router is downstairs across the house and it connects to the whole house wirelessly. However, my room has a problem. My laptop is constantly at a 1 or 2 bars. My iPhone doesn't connect to Wi-Fi. And my ps3 doesn't sign in. However, the room directly across of mine has alittle better connection then mine. I've been told many things to solve this: Range extenders, High gain antennas, and many more. Can you tell me what to buy from amazon? Links will be much appreciated.

3ashan el wireless ma beshta3'el mnee7 fo2 7asab keef shekel el Wi-Fi

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