This paper deals with the design of a 5GHz WLAN heterodyne transmitter for domotic applications. The transmitter has been realized in commercial 0.35μm Si/SiGe BiCMOS technology with the purpose to reduce cost while achieve an high integration level. Measurements on a prototype, wire-bonded on a low-cost FR4 printed circuit board, have been carried-out showing an overall linear gain of 14dB an input referred compression point of -6.5dBm and a third-order input intercept point of +2.7dBm.