Stefano <oppenheimer@bomb.ne> wrote:

> Hello, i realized a WLAN in my small apartment. Works ok, the only thing
> is that i have my desktop in a bad place for receiving WLAN signal.

I have used the "Hawking HAI6SDA Directional 6dBi 2.4GHz Antenna" with good
success on a Netgear WG311 PCI card. $20-30.
<http://www.hawkingtech.com/products/productlist.php?CatID=32&FamID=58&ProdID=122>

Hawking and others have USB clients built into antennas. That might be
handy.
<http://www.hawkingtech.com/products/productlist.php?CatID=32&FamID=60&ProdID=280>

Within a single room, any USB adapter would let you get the antenna
positioned in a better place. I see the Linksys WUSB11 for $7 in the US.
Netgear WG111 for $12.

> Now, the question: how can I workaround this problem, possibly in a
> frugal way?

If you can't relocate the PC, can you relocate or re-orient the AP?

I would favor a free reflector on the PC and the AP.
http://www.freeantennas.com EZ-12 Windsurfer.

Remember that you want the PC and AP antennas pointed broadside to each
other, not end-on. The antenna pattern is like a donut on a stick, with
the direction off the tip of the antenna being the weakest signal.

--
---
Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5