  This contribution provides experimental evidence for the two-wave with
diffuse power (TWDP) fading model. We have conducted two indoor millimetre wave
measurement campaigns with directive horn antennas at both link ends. One horn
antenna is mounted in a corner of our laboratory, while the other is steerable
and scans azimuth and elevation. Our first measurement campaign is based on
scalar network analysis with 7 GHz of bandwidth. Our second measurement
campaign obtains magnitude and phase information, additionally sampled
directionally at several positions in space. %This second measurement campaign
is limited to 2 GHz bandwidth. We apply Akaike's information criterion to
decide whether Rician fading sufficiently explains the data or the generalized
TWDP fading model is necessary. Our results indicate that the TWDP fading
hypothesis is favoured over Rician fading in situations where the steerable
antenna is pointing towards reflecting objects or is slightly misaligned at
line-of-sight. We demonstrate TWDP fading in several different domains, namely,
frequency, space, and time.
