Soyuz Rocket Booster Re-entry 24/12/11

Re-entry was visible from several Western European Countries on Xmas Eve 2011
Several videos can be found on Youtube
This network shared it's radar detections with the British Astronomical Association(BAA) and other European Partners.

International Space Station (I.S.S.)

Diagonal Trace detection of the I.S.S. as it passes through the G.R.A.V.E.S. Radar beam.
The I.S.S. orbits Earth every 96 minutes.

Tropospheric Radio Propagation

Tropospheric ducting is a type of radio propagation that can occur during periods of anti-cyclonic weather. On such occasions, a change in the refractive index of the atmosphere at the boundary between air masses of different temperature and/or humidity can cause a radio signal to be bent to follow the curvature of the Earth.  Radio signals enhanced this way can often travel up to 800 miles (1300Km) - and even further under extreme conditions. Receiving distant FM Broadcast Stations is a typical result.
  Troposheric ducting generally affects VHF and UHF radio frequencies, typically between 40MHz and 500MHz, most favouring 90MHz-200MHz.

The images to the left show how Tropospheric Propagation affects our systems. In these images they were receiving the radio signal direct from the G.R.A.V.E.S. Radar Station. The lower image also shows a Meteor and Satellite detection.