A transmission antenna apparatus is provided to emit transmission magnetic fields in magnetic resonance imaging scanners. The transmission antenna apparatus includes at least a first flat antenna and a second flat antenna. The first flat antenna is arranged in relation to the second flat antenna in such a way that first areas, formed in the planar extent of partial structures of the first flat antenna in each case situated in the same plane, are opposite to second areas, formed in the planar extent of partial structures of the second flat antenna in each case situated in the same plane, in a manner mirrored in a mirror plane. The first flat antenna and the second flat antenna, as part of the structure thereof, share a first path, situated on the mirror plane, over the full length of the path. The magnetic resonance imaging scanner has such a transmission antenna apparatus.