Great option to use 3.3GHz Iron Horse transmitter with minin quads. It will drop the output power from 1000mW (30db) to approximately 500mW (27db).
SMA 3dB attenuation 50 Ohms 1W DC to 6000 MHz.
See Datasheet: 3db_attenuator.pdf 

Features

• wide band coverage, DC to 6000 MHz
• Attenuation 3db 1 watt rating
• rugged unibody construction
• SMA Male to Female
• off-the-shelf availability
• very low cost Applications
• impedance matching
• signal level adjustment