Original article from: Wayne Sarosi 
 Reposted by Rob Dennis,Moderator HAM_TECH,for use of the FIDO HAM_TECH echo.
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SUBJECT: UHF Rhombic
 In wire antennas part 5 we discussed the UHF Rhombic antenna.
 I have the plans for one here.
 This antenna is called the Dual Hexamerous Rhombiod or DHR.
 A stripline balun provides a 50 ohm output for interface with hardline or
antenna switch.
 The antenna consists of two stacked six element rhomboids.
 Each six element rhomboid consists of six rhombics of which each rhombic is
19 wave lengths and four sided. Each rhombic is terminated at the 9.5 wave
length mark with a *** 2w resistor.
 Each rhombic is geometrically interfaced to a wooden frame with a common
start and ending point. Nineteen wave lengths was choosen for gain and front
to back ratio.
 The actual plans for this antenna are available via snail-mail through me.
 Please include a legal size envelope and one stamp.
 The BALUN is the key to the antenna and I would recommend this for those who
are into 23cm and have stripline experience.
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Folded Marconi:
 This is an easy antenna to construct and I recommend this highly for those
AROs who have limited room and desire an antenna that performs better than
most wire antennas.
 The design is easy.
 Cut a length of 300 ohm ribbon cable (TV line) using the following formula:
              246/fMHz
 ex:  At 7.15MHz the Folded marconi length would be 246/7.15 or 34.4 feet.
 Cut back about 1/2 inch and expose the leads in the ribbon cable.
 Twist them together and solder. Seal with RTV.
 Punch a hole about one inch down from the soldered end and run a cable tie
through the hole and save for later.
 At the other end, expose about 3/4 inch of lead and solder one lead onto the
center conductor of your coax. The other lead is attached to a ground plane
system or....use the roof flashing on your house.
 You can ground the roof flashing and suspend the folded marconi over the top
of the house. This is the setup I have used here at the QTH.
 The antenna was suspended over the house from my tower to the Palm tree in
the front yard.
 The vertical height was 25 feet and the rest was horizontal.
 With this antenna, the greater the vertical section the better.
 You will need a tuner with this antenna as the impedance is very low.
-WS
--- GoldED 2.42.G1219
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