Total posts : 45366
I don’t think it would honestly take 60 Watts to hit 3-4 miles. 1 Watt could cover at LEAST 2-3 Miles. People think it takes gobs of Power but forget the antenna and their height.
I’ve experimented with 100mW CB transmitters and found that using good material like copper (not copper plated) wire will go further than aluminum wire would. I have some members of The New Radio Revolution who has been working on some things and I can tell you that even 100mW on AM can cover 3-4 miles under the right conditions.
Also as far as antennas and 100 mW bigger is not always better. Even at 1 Watt AM the fact again that the power is low means that it could possibly not even reach the tip of an antenna that is too long. But if you have a good earth conductivity in the soil you can possibly get better range. If you can’t ground the system get it as high as you can. Even AM does better with height.
Oh and if you ran 100 Watts on AM you’d get busted relatively quick. 1-5 Watts you could have a better chance but ONLY in a rural area and that doesn’t make it legal. Just saying facts. There is NO WAY you can even think of throwing a 100 Watt station up without a license for that is what LPFM runs. When I talk about Hobby Radio and what other countries like New Zealand is doing it’s about 1 Watt ERP (Effective Radiated Power) to the antenna. I won’t even dream of asking the FCC for unlicensed service with power levels exceeding 1-2 Watts and that would be a hard sell but again I’m just saying what is more than likely to happen to you if you tried that.
The fact that you want to Advertise makes you an open target if your transmitter is over the limit and here is why: A recent article about Pirate Radio and the FCC talked about how their main enforcement will be towards HIGH POWERED pirates and ones who ADVERTISE. Otherwise if they were running shy over the limit they would not be first priority unless interference was part of the scenario. So just saying once again that in my opinion 1 a few mW’s over may or may not get you a visit depending on the situation. Again not saying it makes it legal but does show that the FCC may be looking on raising the bar a bit.