A system and method for transmitting multiple radio frequency (RF) channels via an RF coil assembly are provided. An RF coil assembly having a number of coil elements may be configured to transmit a number of RF channels which is less than the number of coil elements thereof. Some implementations may use signal splitters for some or all of the RF channels to produce driving inputs for each coil element. By using more coil elements than RF channels, various embodiments may exhibit increased power efficiency and improved B1 uniformity.