A device for equalizing a plurality of radio-television channels comprising subdivision means for subdividing said plurality of radio-television channels into channel groups, each channel group comprising one or more of said channels of said plurality of radio-television channels, so that each channel belongs to a single channel group, wherein said subdivision means comprise a plurality of filtering and amplifying means for filtering only those channels of said plurality of radio-television channels which belong to a respective channel group and for amplifying said channels of each channel group in a homogenous manner, characterised in that said filtering and amplifying means are controlled by a controller in a manner such that the channels outputted by each of said filtering and amplifying means have the same signal level; each of said filtering and amplifying means comprises a variable-frequency and variable-bandwidth filter and an intermediate variable-gain amplifier, and wherein said device comprises upstream of said plurality of filtering and amplifying means, a distribution matrix for replicating said plurality of radio-television channels at the inputs of said filtering and amplifying means and, upstream of said distribution matrix, an input variable-gain amplifier for amplifying said plurality of radio-television channels, downstream of said filtering and amplifying means, an adder for adding up said channels outputted by each of said filtering and amplifying means and, downstream of said adder, an output variable-gain amplifier, and wherein said device is configured for: - adjusting said input amplifier and said output variable-gain amplifier to respective maximum gain values; - powering in rotation only one of said filtering and amplifying means; - adjusting the variable-frequency and variable-bandwidth filter of said only one filtering and amplifying means to the bandwidth of one channel of the channel group corresponding to said only one filtering and amplifying means, and adjusting the respective intermediate amplifier to a known and predetermined gain value; - measuring the output power of each channel of said channel group; - for each channel, obtaining the input power upstream of said input amplifier from said output power and the gain values of said input amplifier, said intermediate amplifier and said output variable-gain amplifier; - adjusting the gain of the input amplifier in a manner such that the channels outputted by said input amplifier have the highest signal level without generating any distortion in the signal itself; - adjusting the gain of each filtering and amplifying means in a manner such that the channels outputted by each of said filtering and amplifying means have the same signal level; - adjusting the gain of said output variable-gain amplifier so as to obtain, at the output of said output variable-gain amplifier, channels having the highest possible signal level as well as distortion and noise figure levels below a predetermined limit. - adjusting said input amplifier and said output variable-gain amplifier to respective maximum gain values; - powering in rotation only one of said filtering and amplifying means; - adjusting the variable-frequency and variable-bandwidth filter of said only one filtering and amplifying means to the bandwidth of one channel of the channel group corresponding to said only one filtering and amplifying means, and adjusting the respective intermediate amplifier to a known and predetermined gain value; - measuring the output power of each channel of said channel group; - for each channel, obtaining the input power upstream of said input amplifier from said output power and the gain values of said input amplifier, said intermediate amplifier and said output variable-gain amplifier; - adjusting the gain of the input amplifier in a manner such that the channels outputted by said input amplifier have the highest signal level without generating any distortion in the signal itself; - adjusting the gain of each filtering and amplifying means in a manner such that the channels outputted by each of said filtering and amplifying means have the same signal level; - adjusting the gain of said output variable-gain amplifier so as to obtain, at the output of said output variable-gain amplifier, channels having the highest possible signal level as well as distortion and noise figure levels below a predetermined limit.