Total posts : 45366
An FM transmitter at USA allowed field strength with line of sight with no obstructions would make it 450ft with a car radio for sure,with no other station interfering. Maybe a hi-fi separate component tuner where FM sensitivity would be around 3uV for at least 30dB quieting would get it, not with a typical portable or other radio like a boombox. Transmitters?…CCrane, Wholehouse, Decade CM-10,etc. all are FCC compliant for the max allowed in the USA and don’t cost a whole lot. The Decade is probably the best of them.