Any of the external antennae on our website will work with this router, or for that matter, any external antenna that has an RP-SMA connection should work as well.
A "pigtail" adapter may be needed to change from one type of connector to the RP-SMA style connector,
Specifically, the WLE-2DA is a high-gain directional antenna designed to be used with the WHR-HP-G300N, as it has 2 RP-SMA connectors on it for the 2 connectors on the router.