Shakespeare 5215-C-X Classic Masthead VHF Antenna KitView all products in Antennas

Gain is the transmission pattern of your antenna, measured in decibels (dB).

The higher the dB, the farther the range. As gain increases, beamwidth is narrowed.

Small, lightweight boats, which tend to roll excessively in heavy seas, normally do not use an antenna with a gain rating higher than 6dB.

Larger or more stable vessels can use higher gain antennas effectively.

• 3 dB Gain: Usually, a 4' antenna is best suited for powerboats under 24' or sailboats.
• 6 dB Gain: Usually, an 8' antenna is best suited for boats over 23'.
• 9 dB Gain: Usually, any antenna 12' or taller is best suited for boats over 32'.

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