Of course you can't rotate it if it is just wires strung between If you are lucky enough to have several tall trees, building a 2-element Delta Loop beam is easy and very inexpensive to implement. The reason that the Delta Loop has disapeared from the commercial market. As a result, the Delta Loop is not as robust as a Quad. Whereas the Quad requires 4 spreaders (supports), the Delta Loop only needs 2, but they are quite a bit longer. Being 3-dimensionals, with full-wavelength elements, these were huge and cumbersom,Īnd tended to come down in storms more often than Yagi (beam) antennas. Unlike typical Yagi antennas with half-wavelength elements, the elements of the Quad and theįormerly there were companies selling Delta Loop antennas commercially, but I haven't seen any recently. Like the Quad, the Delta Loop Antenna is a 3-dimensional antenna. You can purchase a complete antenna kit with all of theĬomponents required (except Coax), from Spiderbeam, or even a fully assembled antenna. If you prefer to 'Do it Yourself', you can even download the Spiderbeam Construction Guide forįree, here: SPIDERBEAM CONSTRUCTION GUIDE The Spiderbeam is basically the same antenna. Information about the original Bird Yagi available, but unfortunately Dick Bird is now a Silent Key. IMHO: The Bird Yagi concept and design is very good. This antenna was published in The ARRL Antenna Compendium, Volume 2 in 1989 (pages 58-60). By using 4 fiberglass 'arms' (spreaders) and wire elements, Dick was able toĭesign a wire beam that was both robust and functional. Performance of this antenna is very close to that of a classical monoband Yagi. The Bird Yagi is a Full-Size Yagi, whose parasitic elements ends are bent back towards the driven element. After the Bird Cage, he designed the Bird Yagi. We all know the joke about 'back to the drawing board'. The Bird Yagi was also designed by Dick Bird, G4ZU (SK). Spiderbeam, Hex Beam, etc.) are much easier to build and give you multiple bands. IMHO: The Bird Cage Antenna is too much fuss, unless you absolutely must have the smallest antenna possible. Here is a Link to more information: The Birdcage Antenna. Cebik, W4RNL (SK) wrote an excellent analysis of this antenna. In my 50 years on the air, I have only spoken with a few OM This antenna kind of resembles a bird cage, and since Dick's surname was 'Bird', this antenna was called the Bird Cage Antenna. There are easier antennas to build than the Bird Cage, but it is Like the Quad and Delta Loop, this antenna is a 3-dimensional antenna, which is partly what makes building it so difficult. Material I used was too flemsy and it kept collapsing. I got mine to work, at least a little bit, but I could not keep it working. This was the very first wire beam that I ever built. It is basically a folded X-Beam, and very compact. The Bird Cage Antenna was designed by Dick Bird, G4ZU (SK).

Antenas yagi 10m