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further reading
The ARRL Antenna book has an interesting article about 'HF Discone Antennas' including some historical facts.
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Discone Antenna Calculator

Discone schematics Discone details

min. Freq. [MHz]


Φ [°]

Ls [mm]


Lv [mm]

Cmax [mm]


Cmin [mm]

D [mm]


S [mm]

Hint :

An interesting application note about WLAN discones (2.4 to 5 GHz) by Clemens Verstappen (DL3ETW) appeared in FUNKAMATEUR, 2/2013, p.156

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t1 = 3758 d

t2 = 341 ms

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