I can confirm that they work well on Glonass and Beidou. I have not tried them on my Z12 with L2 signals. Last night a big lightning strike across the street took out a tree. Antenna survived without damage, but my antenna is on a 3 foot tripod on the ground... it was quite a brown-trousers producing, ear-ringing strike. BTW, the HP/Symmeticom 58517A antenna splitter/amplifier seems to work well with Glonass/Beidou. I don't think it does L2, etc.