One DVB-T2 multiplex on channel 24 is missing, what is the best way to connect 3 sources to the TV network?

Question

Antenna

Good day!
They puzzled me here with digital TV, in this matter I am an amateur, I know how to hang up the antenna, screw the F-connector to the amplifier and plug the plug into the TV. ;)
There is a large 4-storey private house + two more small houses. The house is located in Moscow outside the Moscow Ring Road 5 km. A system of 3 MV-MV-UHF antennas is installed on the roof of a large house, all this is connected to the head station (hereinafter referred to as GS) Planar SG-2000 for 19 channels (MV channels: 1,3,8,11,12,6; UHF channels : 25,27,35,46,60,29,38,49,57,23,31,33,51) then the HS is connected - to the ALCAD FI-244 splitter - a video surveillance system is also connected to it. see diagram
block diagram
On a TV with DVB-T2, only 2 multiplexes are caught, on channels 30 and 34, the signal level on the ground floor is kept around 70-80% - the picture does not fray, everything is OK. 24 channel signal level 0 sometimes it appeared and showed 76%, now it is completely gone.
I took the telly armpit and climbed into the attic to Planar, I connected the TV directly to the UHF antenna without any amplifiers in order to exclude the effects of the head station - 30 and 34 channel signal 100%, 24 channel - 0%, I took ordinary indoor horns connected to the TV in the same place in the attic TVK 30 and 34 - 20-30% signal, channel 24 - about 20-30%.
The experiment continued:
He dragged an ALCAD CF-512 multiband amplifier with the ability to connect 3 UHF antennas, and 2 meter ones, stuck the antennas into it, twisted the knobs - analog TV began to show worse on the ground floor, it disappeared completely in neighboring houses, DTV is the same picture: no 24 channels, 30 -34 is fine. I realized that this amplifier is not enough for an analogue, returned Planar.
Then an idea arose to plug indoor horns into this ALCAD, turn the gain by 80% and mix the signal from the amp to Planar: which I did, disconnected the Terra amp from the video surveillance cameras from the ALCAD FI-244 splitter and connected ALCAD CF512 with horns - all 3 multiplex for showing.

Analog TV has become worse, it is clear that interference is coming from ALCAD CF512.
What would be the correct way for me to put this 24th channel there, maybe there are some filters?
How can I connect 3 sources to a common TV network, Planar + Camera Recorder + Alcad CF512 (with horns) ? Can I use a splitter with 3 outputs or do I need an adder?
PS I know that this is a crutch, and the source of my problems is most likely a street UHF antenna - but there is no way to change it yet.