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to have a gain of 10, a dish size needs to be the same as the wavelength.
and if you wanted a 20dB gain dish for 11 meters, it would need to be 35 meters (115 feet) in diameter.
For 30dB gain, it would need to be 110 meters or 360 feet in diameter, for 11 meters.

if you dont believe me:
gain = (9.87 * diameter*diameter) / wavelength*wavelength
diameter = sqrt((gain * wavelength*wavelength) / 9.87)

but the dish doesnt need to be solid metal, could be a wire mesh with no more than 3 foot gaps in the mesh. Still would be a monster.

[QUOTE="dudmuck, post: 126531, member: 3904"] to have a gain of 10, a dish size needs to be the same as the wavelength. and if you wanted a 20dB gain dish for 11 meters, it would need to be 35 meters (115 feet) in diameter. For 30dB gain, it would need to be 110 meters or 360 feet in diameter, for 11 meters. if you dont believe me: gain = (9.87 * diameter*diameter) / wavelength*wavelength diameter = sqrt((gain * wavelength*wavelength) / 9.87) but the dish doesnt need to be solid metal, could be a wire mesh with no more than 3 foot gaps in the mesh. Still would be a monster. [/QUOTE]

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