I bought this about 6 months ago. My home office computer is about 50 feet from the D Link router through steel reinforced concrete walls. I usually get a very low wireless signal with frequent drop outs. When I tried the antenna 6 months ago it made no difference. I just tried it again as I was losing my signal. I attached it directly to the router and set it vertical as advised. I now have a 2 to 3 bar signal. From the reviews I gathered that it's kind of a hit or miss purchase but I'm glad that I didn't write it off at first impression and that it's now working for me. I'd give it 5 stars but I think it's a little overpriced. ( I paid $37)