We experimentally investigate pulse shaping in the optical domain of ultra-wideband pulses and RF transmission via a wideband antenna. The effective isotropically radiated power (EIRP) is calculated based on the measured transmit power; the resultant power spectral density (PSD) is compared to the FCC (US Federal Communications Commission) power spectral mask for each of three generated pulse shapes: a Gaussian monocycle, a Gaussian doublet and a waveform adapted to the FCC spectral mask.