Indispensable for several tv with an amp, as an example I have connected to my tv 6 taken installation.Damage 5 tv signal tested thoroughly on tnt chains with mininum preamp (25 db) so there is still room . Caution required with an amp! * The only amp is not enough! This preamp replaces a pro brand that laché and it is EXCELLENT. Quick service perfect price, buy the Amazon merçi ............. ragnard66