Be careful as a loud level can sound fine on a radio next to the transmitter, but horrible down the road where the signal is weaker. Too high and it will distort and sound horrible. Too low and there will be lots of hiss on stereo as people will have to turn up louder to hear you. Also, I have a feeling the pCI max may give more power at the lower frequencies than the top of the fm band. Bear in mind some radios are bad at selecting a weak signal next to a stiong one, so try to keep at least 0.5MHz from any strong stations. Find the clearest channel you can on the fm band (may not be easy). The tricky bit is soldering the co-ax to the copper which needs the copper to be extremely clean with wire wool etc. For the dipole a bit of copper pipe attached to a wooden batten is fine. I wouldn't bother with anything complicated like a Slim Jim - just use a simple quarter wave dipole or the other antenna which looks like an umbrella frame. I presume you have read the instructions on how to make an antenna. Outside on a chimney pot is ideal, but in aloft would be acceptable but would reduce range a bit. The range will depend on how high you get your antenna and how clear it is of nearby obstacles. You must use proper co-ax connections, and use as fat a co-ax as you can find. 5w is certainly enough to run a radio station which should easily go a few miles.
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