This can again be used to restrict your card to 802.11b/g or 802.11b, it's best to leave this option default for compatibility reasons unless you need to change them under certain regulations. Unless you have throughput problems on either, it's best to leave this option enabled. This avoids your WiFi and Bluetooth from interfering each other by suppressing each others signal when they are both sending something. As this again can be configured in the router, you can leave this to the default as you most likely don't want to restrict the compatibility of your card. Within a frequency range like 2.4 GHz or 5 GHz, 20 MHz stands for a single channel while 40 MHz will take multiple neighboring channels. This option might be handy if you have interference at home on the 2.4 GHz or 5 GHz band or need to comply to regulations that restrict the use of a band it's best to leave this to its default so that you can connect to both as you can just configure the band on the router to avoid interference. You don't need this option if you are already able to internet with your network card and are connected to the right AP. If you have a very old router, this option will trade performance for compatibility. However, you should probably leave this to the default which automatically switches between both antennas based on the signal strength. This only applies if you have two antennas, you can select which antenna to use. Be sure to read the documentation provided by both your wireless card and router for an explanation and to check compatibility. You might want to verify change with a speed and ping test though. Only when you have an 802.11g network, enabling this option on both the router as your laptop can result in a better throughput. If you want to comply to those, this option is for you but in general, I live there and I'm just using 802.11n. For example, 802.11h is designed to comply with European regulations. This option restricts your card to either 802.11h, 802.11d or both which are under certain regulations. Here is the list explained from my point of view: Note: I don't know your background, but if a term is unclear then Wikipedia helps a lot. You need to change specific options like 'disable upon wired', 'mac address' when your network driver doesn't provide you with a more easy Configuration GUI. You need to comply to regulations, laid by your company or country or other rules/laws. You attempt to improve reception/throughput when it's performing bad. The gest is that you can leave most settings to their default, unless:

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