Aerial cables from the shed

[Mixmaker]

Hello guys! Does anybody know how can i find out the way that TV cable has been pulled in into my flat?In the shed we have signal splitter from aerial, and from that shed cable going into a flat.As i have downlights on my ceiling, i pulled them all out to see if there is any tv cable running behind plasterboard ceiling, i could not see anything.is there any other way contractors used to run this cable? I am sure they did not chased plasterboard from the ceiling, as its old ceiling.

p.s I live in the block of flats(its only have 2 floors),my flat is in the middle floor.

 

[amlu]

try tracing where it goes into the building from outside? maybe buried in some conduit in the ground, ends up under the floorboards?