That isn’t correct KP, at least in NSW. If an owner does works affecting common property and doesn’t get permission, unless the OC acts to require an exclusive use by-law (or possibly removal), the works (or whatever it is) become the responsibility of the owners corporation.
Yes teamwalrus you are right – a purchaser without notice would quite rightly object if they bought an apartment with air conditioning, and then the OC said sorry you can’t have it any more. I wouldn’t like to be the OC in that kind of situation. That is why it is so important to make it clear who is responsible for what.
In the case of a TV aerial what I am saying is that generally it is a reasonable expectation that residents will get TV reception. How the OC provides that is up to them, so if they want to take the old aerial away and replace it somewhere else fine, as long as the resident has TV reception.