: A half-wave dipole in free space produces a maximum electric field of: : E = SQR(49.2*P)/D , where : E = field in Volts/Meter : P = power in Watts : D = Distance in meters : : So for 15848 uV/m at 30 meters, I get 4.6 milliwatts. No wonder one person barely heard me, I had an output of 1.2mW. Kurt