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Old 07-22-2002, 02:47 PM
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Default Offshore Radio Antenna

I do some offshore fishing up to about 35-miles maybe 40. I don't want to gear up with an expensive sideband unless I really need to. My local marine shop rep suggested a VHF "off-shore" antenna, which is about 20' high. Do these really work with a 25-watt VHF radio? What kind of distance can I expect?
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Old 07-22-2002, 04:22 PM
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Default Offshore Radio Antenna

8' shakespear galaxy or digital(brand) will do.


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Old 07-23-2002, 04:52 AM
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Default Offshore Radio Antenna

What kind of boat are we talking about, 50' Viking or a 25' Center console? I can't picture a 20' antenna on the cc. While 35 to 40 miles intot he ocean is "off shore", unless there is never anyone else around, I would stick with the normal VHF set up. If there is trouble, others will relay your messages. If you start doing 90+ mile trips then get the SSB.
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Old 07-23-2002, 06:25 AM
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Default Offshore Radio Antenna

Yes they work. I had the same delimma you are talking about when I purchased a 23 ft Mako in 1978 onto which I first installed a Shakespeare 8 ft, 6db antenna on the top of my t-top. This antenna worked fine and I found I could transmit about 15 miles to another like size boat and 30 miles to the marine operator. I wanted more range so I went to a Shakespeare model 4018, 19 ft, 9db antenna and my range almost doubled. I also installed an external speaker on the radio. Several people told me that the 19 ft 9db antenna would not work on my small boat because it rolled around too much and was not a stable enough platform for a 9db antenna, but I am still using these antennas on small boats and have not experienced any transmitting or receiving problems.

Three years ago I was 15 miles east of Bimini (about 68 miles from Miami) and had an engine problem on my 31 Contender. I had no problem calling the marine operator in Miami and completing a call to my mechanic who helped me solve my problem over the radio. I'm confident I could not have placed that call with an 8 ft, 6db antenna.

On the down side some think the big antenna looks funny sticking a long ways up above anything else on the boat, it requires a solid upper mount at least 4 ft above the base mount, and it requires more work when trailering as it must be lowered and or taken apart (it is a 2 piece antenna), and secured to something (I lower the antenna forward and wrap a small towel arount the upper part, and then secure it to the fwd grabrail with a small bungee cord)

[This message was edited by Cat-fishn' on 07-23-02 at 11:40 AM.]
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Old 07-24-2002, 06:52 AM
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Default Offshore Radio Antenna

VHF is pretty much "Line of sight" so the higher your attenna, the more range. A 20 foot antenna will definitely reach out further than a six foot. However, you also need to factor the height of the antenna on the receiving end. The Coasties have 100 foot towers, so your six foot will probably work. Boat to boat, may be a different situation.

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Old 07-24-2002, 04:40 PM
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Default Offshore Radio Antenna

KeysKid: Yes, the height of the receiving antenna is not just a factor, but a major factor and I'm sure the height of MarTel's antenna was one of the reasons I was able to talk to them when I was 15 miles east of Bimini. While height is a major factor, the greater gain of higher antennas (9db vs 6 db on a 8 ft antenna) is also a major factor in being able to "punch" out a transmission on a small boat.
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