In addition to this, how long should a VHF antenna be?
The wavelength of a signal should always be 1/4 the length of the antenna you're using, as this gives you the very best efficiency. While you don't have to pick an antenna whose length is exactly 4 times the wavelength of the signal, it's a good idea to get as close as you possible can.
Anyhoo, why do some boats have 2 VHF antennas? Active member. Twin VHF arials almost always indicate the boat has or had a duplex VHF at some point. Duplex was the in thing befor DSC and meant that you could have a two way conversation with another duplex set i.e you could both talk at the same time like a phone.
On another note, can you use VHF radio on land?
Marine VHF radios, whether fixed or handheld, may not be used on land, period. It's the law. Once a VHF radio goes ashore, it cannot be used for marine band transmission (without a Coast Station License).
Does a VHF antenna need to be grounded?
Do I need a ground plane for a VHF antenna? Not necessarily. Shakespeare VHF and CB Marine Band antennas are designed with independent ground planes built in. SSB antennas, on the other hand, must be properly grounded.
BESTSELLER NO. 1 in 2021
Shakespeare 5104 4' Centennial VHF Antenna
1"-14 threaded mount
BESTSELLER NO. 2 in 2021
Tram VHF Marine Antenna
Country Of Origin : United States
The Package Height Of The Product Is 3.5 Inches
The Package Length Of The Product Is 37 Inches
The Package Width Of The Product Is 5.5 Inches
BESTSELLER NO. 3 in 2021
Shakespeare 5225-XT 8' VHF Antenna
BESTSELLER NO. 4 in 2021
Shakespeare 5206-N White 8' Marine Antenna
Clean and clear audio
BESTSELLER NO. 5 in 2021
ZOMCHAIN Marine VHF Antenna Mounts, Ratchet Mount, 316 Stainless Steel Adjustable Base Mount for Boat
✔ Size: Base measures 3 9/16" x 2 1/2" , 0.87" - 10 thread male, 3/8" hole for cable pass through, Hole diameter 5/16"
✔ 316 Stainless steel: Marine grade 316 stainless steel, rust-proof, Excellent seawater corrosion-resistant and durable. Highly polished to a beautiful mirror-like finish
✔ Packaging: There are two kinds of screw fittings for your choice, one is the bolt, the other is the screw (All accessories are made of 316 stainless steel)
✔ Anti-Corrosion Materials: Marine Antenna Mount made of precision cast 316 marine grade stainless steel
✔ Exquisite design：The antenna pedestal has two adjustable ratchets. The upper ratchet has an adjustable angle of 270 degrees and the lower ratchet has an adjustable angle of 180 degrees
BESTSELLER NO. 6 in 2021
Shakespeare 6225-R Phase III VHF Antenna - 8' VHF Marine Band 6dB Gain
VHF (very high frequency) signals occupy the lower end of the radio frequency spectrum. The longer wavelength of VHF enable it to travel further than UHF, so VHF radios could be right for you if you are primarily looking for two way radios for outdoor use.
The antennas do not actually ever "go bad" however just like everything they are susceptible to water damage. If yours is sealed and has no signs of corrosion it will be fine. All that is inside of them is a wire of the proper wave length, keep it dry and it will last forever.
A VHF radio is not a telephone. When you use your VHF, everyone tuned to that station in the area can hear you! Watch your language, and try to keep your conversations short and to the point so that others may use the channel.