enhancing the signal of my D-Link 624 router

Helle NG,

recently I have bought a D-Link 624 router for setting up a wlan in my
house. I realized that the signal of the router does not reach all the way
through my house. Now I wondered if there is a way of enhancing the signal
of the router without having to use any more cables. I am thinking about
some kind of repeater or something like that.

What would be the appropriate item for enhancing a router signal without
installing any more cables? I would not mind using an external antenna for
my router but I do not want to equip my notebook with a more powerful
antenna.

Thanks very much for your help!

Greetings,

Jens Lipperheide