A 3dB gain antenna has a nice circular transmit and receive pattern, whereas a 6dB gain antenna operates in more of an oval vertical plane. For every 3dB increase in an antennas gain rating, the effected radiated power of the antenna doubles.

What is dB VHF antenna?

Usually a 6 dB antenna is recommended for boats over 24 feet and a 9 dB antenna is recommended for boats over 32 feet. Longer antennas generally have higher dB ratings but check the technical specifications of the antenna to be sure. Additionally, height is always an important factor.

What size VHF antenna do I need?

A 3- to 4-foot antenna that’s 3 dB is generally recommended for boats under 24 feet. Larger vessels can opt for 12- to 18-foot, 7 to 8 dB antennas. “As a general rule, antenna height should be less than half the length of the boat,” Catoe says.

How do I increase my VHF range?

How can I expand the range?

1. Elevate your antenna. Antennas are a vital solution to achieve clear communication not only within base stations, but in temporary and mobile situations as well.
2. Invest in a rebroadcast system.
3. Increase power.

What is 3db antenna?

The term Antenna Gain describes how much power is transmitted in the direction of peak radiation to that of an isotropic source. Similarly, a receive antenna with a gain of 3 dB in a particular direction would receive 3 dB more power than a lossless isotropic antenna.

What is 3dB antenna?

Can you shorten a VHF antenna cable?

Can I cut the cable on my VHF antenna? Yes, if you need to. However, you should leave at least three feet of coax, measured from where the cable exits the antenna.

How can I improve my VHF antenna reception?

Get a new antenna. Switching from an indoor to an outdoor antenna can greatly improve FM reception. If you have a directional antenna, try switching to an omnidirectional antenna, or vice versa. Directional antennas can pick up stations from farther away, but omnidirectional antennas work well for closer stations.

How far will a 5 watt VHF radio transmit?

The 5 watt radio can reach up to 12 miles or more. Some handheld radios have 6 watts which can reach up to 20 miles in the right conditions.

What kind of antenna do I need for my VHF antenna?

VHF antennas are made of stainless steel or fiberglass. For masthead mounting, short stainless “whip” antennas create less windage and provide the appropriate wide radiation pattern required by a heeling sailboat. Small powerboats may also use stainless whip antennas because they are rugged.

How does a VHF antenna work on a boat?

Understanding how they work and how to select the correct antenna can greatly improve your ability to communicate with other boaters and shore stations. The main purpose of a VHF antenna is to provide a radiator for the power that the transmitter in the radio produces and to radiate this energy in the correct direction.

What is the difference between a 3DB and 6dB antenna?

Therefore, a radio with a 6dB antenna will sound like it has a larger transmitter than the same radio with a 3dB antenna. Coaxial cable, while efficient, loses some energy with every foot. In the West Advisor on Coaxial Cable we’ve noted that RG-58U coax (the small stuff) loses 3dB for every 49′ of run.

What is the best marine antenna?

Tram 1607-HC 46-Inch VHF Marine Antenna At first sight, I am overwhelmed by the enormous 46-inch length of this Tram 1607-HC VHF antenna. It is so powerful that the antenna offers coverage of all marine band frequencies, which, to me, deserves to be the best marine antenna.