This article is from the Rugby Union FAQ, by roelofs@f2s.com (Mees Roelofs) with numerous contributions by others.
The frequency differs from stadium to stadium, so no unambiguous answer
can be given. However, a broadcasting license is required for any use of
the RefLink system, so you could ask your local radio authority. A listing
for Britain can be found on
http://www.ofcom.org.uk/static/radiolicensing/rsls/sporting.htm. Odds are
your own portable radio will be able to receive RefLink without any problems.
 
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