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Optibeam Antenna
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Optibeam - OB4020x - 8el big Duo Monobander 40 / 20m
OB4020X
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| Bands | 40 / 20 | |
| Gain (dBd)* | 5,6 / 8,3 | |
| Gain (dBi)** | 11,9 / 15,5 | |
| F/B (dB) | 30 / 25 | |
| SWR: | ||
| 40m: 7,000 - 7,100 - 7,250 | 1,60 - 1,10 - 2,00 | |
| 20m: 14,000 - 14,200 - 14,350 | 1,15 - 1,10 - 1,20 | |
| Elements (number) | 8 | |
| Active Elements | 3 / 5 | |
| Max. Elementlength (m) | 22,54 | |
| Boomlength (m) | 15,00 | |
| Turning Radius (m) | 13,34 | |
| Feedlines (number) | 2 Coax 50 Ohm | |
| Weight (kg) | 180 | |
| Windload at 130 km/h | 3.360 N / 4,20 m2 / 45,15 feet2 | |
| * = average gain over dipol in free-space / for comparison: 2 el monobander 4 dBd, 3 el 5-6 dBd |
| ** = average gain at 20m above ground (= dBd + 2.15 dB isotropic + about 5 dB ground reflection) |
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