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Old 03-03-2018, 11:05 PM
theleosen theleosen is offline
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Join Date: Mar 2018
Posts: 1
Question Antenna on hill to handheld radio system


I wish to implement a system that would allow my boat to communicate with the camp on land.

Currently we have ICOM IC-M25 (5W) handheld radios that work well but do not provide enough range. I am looking for a system that would be able to communicate with the boat when it is a maximum of 12km away.

Our land camp has a hill behind it with an elevation of 30m. My question is if I can put an antenna on the hill with a more powerful radio would I be able to have two way communication with the IC-M25 on the boat at 12km. If so what radio and antenna should I look at purchasing?

Or if not, would I need to install a more powerful radio with antenna on the boat as well? And once again what would suffice?

Thank you.
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Old 03-04-2018, 05:42 PM
K6CPO K6CPO is offline
Join Date: Dec 2014
Posts: 96
Default Re: Antenna on hill to handheld radio system

I think the one thing that would be most helpful at this juncture would be knowing where you're located.

I know there are some restrictions on land-based use of marine VHF frequencies in the US but I don't know about other countries. I think land-based use of Marine VHF is generally prohibited with the exception of entities like the US Coast Guard, membership-type vessel assist organizations and marinas.
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Old 03-05-2018, 10:03 AM
paulears paulears is offline
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Join Date: Jul 2015
Location: East Anglia, UK
Posts: 344
Default Re: Antenna on hill to handheld radio system

As said - the legality depends on the Country, but the size of your bank balance matters too. What you are describing requires a repeater, and a decent antenna on the high ground. We do this kind of thing for temporary events, and we simply park a vehicle with the repeater in it on the high ground, and use a roof mounted antenna - or a taller mast when we have to. Our licence lets us hire stuff like this out to our clients which is cost effective. If they wanted to buy the equipment and then take out their own licence, the things gets more complicated and costs go up. A repeater, antennas and the necessary filters would cost here maybe ?1500?

The repeater listens, and being on high ground hears everything - it then retransmits this out again on a different frequency. The height sets the range, power far less so. Anyone within a rough circle around the repeater can talk to anyone else on lower powered equipment.

Your problem is that your M25 is a marine band radio - and you won't get a licence (certainly not if you are in the UK) to use it to talk to a land station inland. Marinas and ports, yes - but Marine is out. I believe the US situation is very similar - Marine is well, marine. You'll need to buy a complete system for this one, I'm afraid.
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Old 03-05-2018, 04:44 PM
K6CPO K6CPO is offline
Join Date: Dec 2014
Posts: 96
Default Re: Antenna on hill to handheld radio system

I'm thinking the OP is probably in the UK as he gave his distances in Km.

Since we've determined the use of Marine radios is out of the question, either a GMRS (or the UK equivalent) or an amateur license would be the best way to go. The situation he describes would probably be feasible with simplex as long as there was direct line of sight between the boat and the hilltop antenna. I've hit a repeater on a 3,500 ft mountain from 85 nautical miles away (over water) with a 5 watt HT and one of my club members conducted a net from Santa Catalina Island off the California coast through a repeater 88 miles away on the mainland with an HT.
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Old 03-06-2018, 04:20 PM
ipfd320 ipfd320 is offline
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Join Date: Jan 2018
Posts: 6
Default Re: Antenna on hill to handheld radio system

Was Reading the Thread and Decided to Search the Legalities from Ship to Shore-- Like In The US we Can NOT as Private Citizens--Here is the PDF Link for the UK-----

But Then I Found This--So I,m Not Really Sure--Scratching My
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Old 03-09-2018, 02:28 AM
Allen12306 Allen12306 is offline
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Join Date: Nov 2017
Location: Shenzhen,China
Posts: 28
Default Re: Antenna on hill to handheld radio system

Is it need to ask the relevant department?As others had said,you need repeater.But specific steps will be a little troublesome.Maybe can find someone to help you to do it.Hope it is helpful.
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antenna, antenna uhf handheld

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