The Lyrids meteor stream has a medium activity and its origin is cometary. Their parent body is the comet Thatcher, that passed the last time near Earth in 1861. The stream occurs in the last days of April and the maximum of activity occurs in the day 22 April. The Lyrids were studied in 2005 and 2006 using radio observations. The radio data were obtained using the meteor scatter techniques. The data were taken from the Radio Meteor Observation Bullettins. The purpose of this analysis is the definition of a profile for the activity of the swarm during the maximum. From the profile they have been defined the main characteristics of the stream. The solar longitude of the maximum of the activity is λ0 = 32.18° ± 0.02° in 2005 and λ0 = 32.01° ± 0.02° in 2006. The data show that the maximum is characterized only from a peak.