UPC splitter for other telly?

Hi, so I am not 100% on how to explain this but I will give it a go.

We have upc in the house, it is piped from the downstairs upc main box into the house mates room and a cable goes from her room into my room so I can watch the standard/basic tv channels on my telly in my room. The house mate got a new tv last week and hooked it up to the upc box thing on the wall in her room but now my channels are all gone, we didnt know I was getting the channels in my room from her room until she connected her telly to the wall upc box thing.
So I was wondering how would I go about this so we can both watch tv in our rooms with this one connection?
Is there a splitter type thing i could connect both our tvs to this one upc box in her room? and where would i get such a thing?
Any help would be great!

I am sorry to mods if this is in the completly wrong section, but any help would be great!

Thanks!