wireless card as access point

[Sam Wun]

Hi,

I recently experienced some connection problem when sharing the wireless
connection with my brother at home.
If I go online first, my connection goes very fast, but my brother's
internet connection will go very slow.

I heard that some of the wireless card does not handle multiuser network
connection. Is this true?

The wireless card I m using in my mini WRAP box is a mini card. Its
configuratino is;

ath_hal: 0.9.17.2 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
ath0: <Atheros 5212> mem 0x80080000-0x8008ffff irq 9 at device 17.0 on pci0
ath0: [GIANT-LOCKED]
ath0: Ethernet address: 00:15:6d:50:0e:2a
ath0: mac 5.9 phy 4.3 radio 4.6

If this card is not good, which mini wireless card is good to work with
FreeBSD as wireless access point?

Thanks
S