Here is the response I received from TP-Link about the unit:
[FONT="]Does this connect to where one of the antenna is on the router?[/FONT]
[FONT="]No, this is an access point, you can choose the repeater mode to extender the wireless. When the device working in repeater mode, it needn?t connect to the router with cable or antenna.[/FONT]
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[FONT="]Does it only transmit N? [/FONT]
[FONT="]For the Wireless Standards, the TL-WA7210N support the IEEE 802.11n,IEEE 802.11g, IEEE 802.11b[/FONT]
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[FONT="]What is needed on the other end to receive the signal - just a router? [/FONT]
[FONT="]If you make the device working in repeater, it connect to the router by wireless, then it can broadcast wireless signal to more far, and they also have a etherent port, you can connect one computer on it. [/FONT]
[FONT="]Or you can buy tow 7210, make them one wotking in access point mode, the other one located in other building working in client mode. [/FONT]
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[FONT="]Does it have to be N and what about it being 5ghz does that mean I need a 5ghz access point on the other end. [/FONT]
[FONT="]The TL-WA7210N is a 2.4G wireless access point, so mostly it can just connect to a 2.4 G wireless router, if you have a 5G wireless router, please try to buy something like WA7510, the WA7210 doesn?t support 5G.[/FONT]
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[FONT="]The TL-WA7210N has a Directional Antenna, if you want to make it working as a repeater, please make the location close to the main router, otherwise it can?t get the wireless signal form the main router very well.[/FONT]
[FONT="]Or if you don?t mind, you can try the client mode, the wireless will be more stable.[/FONT]