无线网卡天线根数多了有什么好处?

关于AP覆盖范围和无线网卡接受范围的问题?
AP加装天线可以轻松覆盖室外300米以上的范围,但是笔记本的无线网卡发送范围应该远小于这个范围吧（印象中室外50米左右）.它们之间是怎样通信的呢?

无线网卡驱动安装英文版,谁帮我翻译?
Build Instructions:
1> $tar -xvzf DPB_RT2870_Linux_STA_x.x.x.x.tgz
go to "./DPB_RT2870_Linux_STA_x.x.x.x" directory.
2> In Makefile
set the "MODE = STA" in Makefile and chose the TARGET to Linux by set "TARGET = LINUX"
define the linux kernel source include file path LINUX_SRC
modify to meet your need.
3> In os/linux/config.mk
define the GCC and LD of the target machine
define the compiler flags CFLAGS
modify to meet your need.
** Build for being controlled by NetworkManager or wpa_supplicant wext functions
Please set 'HAS_WPA_SUPPLICANT=y' and 'HAS_NATIVE_WPA_SUPPLICANT_SUPPORT=y'.
=> #>cd wpa_supplicant-x.x
=> #>./wpa_supplicant -Dwext -ira0 -c wpa_supplicant.conf -d
** Build for being controlled by WpaSupplicant with Ralink Driver
Please set 'HAS_WPA_SUPPLICANT=y' and 'HAS_NATIVE_WPA_SUPPLICANT_SUPPORT=n'.
=> #>cd wpa_supplicant-0.5.7
=> #>./wpa_supplicant -Dralink -ira0 -c wpa_supplicant.conf -d
4> $make
# compile driver source code
# To fix "error: too few arguments to function ˉiwe_stream_add_event"
=> $patch -i os/linux/sta_ioctl.c.patch os/linux/sta_ioctl.c
5> $cp RT2870STA.dat /etc/Wireless/RT2870STA/RT2870STA.dat
6> load driver, go to "os/linux/" directory.
#[kernel 2.4]
# $/sbin/insmod rt2870sta.o
# $/sbin/ifconfig ra0 inet YOUR_IP up
#[kernel 2.6]
# $/sbin/insmod rt2870sta.ko
# $/sbin/ifconfig ra0 inet YOUR_IP up
7> unload driver
$/sbin/ifconfig ra0 down
$/sbin/rmmod rt2870sta
这是一个无线网卡驱动在linux系统上安装的过程,只不过全是英语,搞不定!谢谢高手来帮我搞定,必定好评!