  Wide-angle tail radio galaxies (WATs) are an uncommon class of radio sources
with luminosities near the FRI/FRII break, and are usually associated with
central cluster galaxies. Their defining characteristic when imaged sensitively
at high resolution is their twin, well-collimated jets, which can persist with
low opening angle for tens of kpc before flaring into long, often bent plumes.
Although several models for the jet termination have been proposed, the
majority of them are unsatisfactory when confronted with observations. Here we
present the results of a programme of radio observations made with the aims of
showing that objects classified as WATs do all have well-collimated jets and
seeing in detail how the jets disrupt as they enter the plumes. We show that
compact, `hotspot-like' features at the ends of the jets are common but by no
means universal, and discuss the constraints that this places on models of the
jet-plume transition. We discuss the properties of the observed well-collimated
jets and, using relativistic beaming models, estimate their speed to be ~ 0.3c.
Finally, we show that the distance from the galactic centre at which the base
of the plume is found is related to the temperature of the host cluster.
