the stupid ads tripod puts up here
Gray-Hoverman UHF TV antenna using fractal elements.
- 2 pieces of insulated solid wire, 1354 mm long.
- 2 wire coat hangers
- 1 piece of 2x4
- 2 dowels
- 5 pieces of trim wood
- 2 wood screws and 2 washers
- 1 bag of small nylon cable ties
- 1 cable transformer
- 2 threaded bolts and wingnuts
Total cost: beats me. I had all
of this just sitting around in my messy basement workshop.
- I used insulated solid copper electrical wire. It was easy to
straighten out, and easy to bend by hand. The insulation allows you to
cable the shapes together for strength and compactness without shorting
across the elements.
- I used fairly sturdy wire coat hangers, just because. Just
straighten the bendy spots out using pliers; it's not rocket science.
- Cut the 2 wire coat hangers into 12 straight pieces, each piece 130 mm long.
- Starting at one end, mark both 1354 mm long insulated solid wires at the
following intervals: 142 mm, and
then 60 mm intervals,
18 times in a row. The final length left over on the other end should
be 142 mm.
- Bend the wire at each mark by hand into the
shapes shown. All but two of the bends are 90 degrees, very easy to
do by eye.
- Cable-tie the shapes together as shown.
- Cable-tie the shapes to the vertical dowels as shown.
- Measure and mark the wood pieces. (Top bars are optional. I used
them for a little additional strength and to keep the spacing
measurements fixed correctly.)
- Drill a bunch of holes where needed. (I needed 22 holes total,
but that's just me.)
- Assemble the main antenna elements; base, vertical dowels, top
bar (optional.) I drilled snug holes for inserting both ends of the
vertical dowels and tapped them into place in the base and top bar.
- Install the reflecting elements into the rear holders; I used a
cordless drill to spin the wire lengths into the holes, which I drilled
for a snug fit. It worked perfectly, and they are tightly fixed in
place without glue. The top and bottom reflecting elements should be
level (more or less) with the top and bottom of the antenna element.
Element spacing: 70 mm, 40 mm, 40 mm, 40 mm, 70 mm. As shown.
- Screw the rear reflecting element holders into the base, as shown. Spacing from the reflecting elemets
to the antenna elements is about 55 mm on my rig (the non-fractal
version calls for 100 mm spacing.)
- Attach reflecter holders top bar (optional.) For the top bar, I
drilled holes and spun in short lengths of coat hanger wire, and then
tapped in the remaining length.
- Strip a little insulation off the
centers of each element and attach the transformer to the drilled
wood center bracket, as shown.
Hook 'er up and see how she does. Mine is