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Try these: http://www.l-com.com/item.aspx?id=21679Gave me about a 20% boost at 50' distance with two wood frame walls between. I can't promise anything, but for the cost of two antennae, it just may be worth it.Let us know if you do give them a try or find something else worth trying.
if you look further down through the DIR-825 forum, you will find this exact same topic. Some folks ordered those L-Comm antennas, and found the $16 price was for a single antenna, not two.I don't remember seeing anyone post that they really improved their signal, or just worked..Look below, you'll find the topic.