Share Wi-Fi 50 feet to a flat?

My brother is due to move into a flat directly over the road from my house(50 feet).
I have 20 mb broadband in my house and a modem and wireless router.
My brother would like a wireless network in his flat for his apple tv and iphone.
Is there a way for me to share my broadband with him not using cables as thats not possible.
I have direct line of sight window to window with no obsticles.

It should be possible. If necessary, the antenna on the router can be fitted with an extension cable to position it in a clear position and the same applies to the Wi-Fi adapter on the computer if it has a detachable antenna.

I don't think that's possible, I think he's gonna have to get his own broadband. Sorry

If you have a direct line of sight it should be no problem to reach him with a Wi-Fi antenna. Set up the antenna (Perferably a Yagi) you can buy them on Ebay for cheap and hang it outside. In certain conditions the wireless signal might be poor but it's probably doable with a little time and high-gain directional antenna.

That's the one time a Wi-Fi repeater (range extender) may be practical.

If your brother puts one in a good spot in his flat so it can access your system, he will have a full signal from the repeater within his flat.

You can get the things easily enough, either online or even Argos - see the links below.

(I don't advise these for within a home as they slow things down slightly & Homeplug works better - but for working across a road they are ideal.)