Follow along as we assemble the feed, attach it to a DirecTV dish and test out its performance. We're building a biquad antenna feed because it offers very good performance and is pretty forgiving when it comes to assembly errors. The dish helps focus the radio waves onto a directional antenna feed. A dish that big is usually overkill for most people and modern mini-dishes work just as well. This summer the longest link ever was established over 125 miles using old 12 foot and 10 foot satellite dishes. Wireless enthusiasts have been repurposing satellite dishes for a couple years now.