I have had success with both a passive system and an active system.

The passive system first appeared in the days of analog cell phones -- it was a cable with a bare wire at each end. The bare wire was a quarter-wave length of the needed frequency; one end was inside the car, the other on top of the car.

One bare wire received the signal, transmitted it along the cable, and the other end radiated the signal. Not very efficient, but it actually improved analog cell phone coverage when you were in a car.

I did this with two such antennas in a large house with a Pronto TSU6000. The wire was around 7" -- I don't remember; you will have to find the frequency used, determine the wavelength, divide by four, and then divide by the amount that the wire you use slows down the flow of electricity -- can't remember the term -- which is about 0.8 for copper.

I got reception at the receiver up to about forty feet. The totally passive one increased this to about sixty feet.

Upstairs in the same house, I stuck a similar wire into the input of a 10 dB cable amp (not a TV antenna amp -- they don't amplify this frequency). This also worked like a charm.

The bare wires at the receiver end were simply upright within about six inches of the receiver.