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Inverted-L for 80m & 160m
- The 18m glassfibre pole from SPIDERBEAM is used, but without the top section too fragile to support the weight wind load of the 80m trap coil<
post 08 Nov 2025
Antenna 80 meter Links →
80 Meter Tower Vertical with Short Radials
The modelled resistance component of the feed point impedance at 3.65 MHz is 80 ohm. It is high due to ground loss and being well off resonance. I chose to simply place a capacitor load in series with tower monopole, chosen to have a reactance of equal magnitude to the inductive reactance of 44 ohm at 3.65 MHz. This requires a capacitor of 1000 pf
Single Support Gain Antennasfor 80 and 160 Meters
Examples of antenna ,Sloper Arrays, having a tower
Antenna vertical for 80m Ground Plane
The 80m GP is made from the base of a Valcom fiberglass antenna that I was able to get through government surplus for a good price. The fiberglass base is 17ft long and the rest was made from aluminum that I had gathered over the years and some specially purchased tubes
Dual Band Antenna 40-80m
PVC Diameter 50mm, total coil turns 78, wire 1.25 mm, for PVC size Diameter 42mm (1 1/4′) the number of turns 89 turns around 100uh
Dual band vertical antenna for 80 meter and 160 meter
Use a 22 meters spiderbeam fiberglass mast with an insulated wire slightly wrapped around it
79
The modelled resistance component of the feed point impedance at 3.65 MHz is 80 ohm. It is high due to ground loss and being well off resonance. I chose to simply place a capacitor load in series with tower monopole, chosen to have a reactance of equal magnitude to the inductive reactance of 44 ohm at 3.65 MHz. This requires a capacitor of 1000 pf
Examples of antenna ,Sloper Arrays, having a tower
The 80m GP is made from the base of a Valcom fiberglass antenna that I was able to get through government surplus for a good price. The fiberglass base is 17ft long and the rest was made from aluminum that I had gathered over the years and some specially purchased tubes
PVC Diameter 50mm, total coil turns 78, wire 1.25 mm, for PVC size Diameter 42mm (1 1/4′) the number of turns 89 turns around 100uh
Use a 22 meters spiderbeam fiberglass mast with an insulated wire slightly wrapped around it
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