Seeing as digital TV is harder to receive than analogue (transmitted at 10% of the power of analogue) as well as having the 'sudden collapse' behaviour I would take any claim as being dubious.
Apart from the cheap VHF coax fitted to the boats VHF aerial losing most of the signal before it gets to the splitter .
And unfortunately you dont want omni aerials when the going gets tough as the ghosting of analogue TV becomes complete loss of digital TV.
In my garage in Hamble for instance I can get the five analogue channels from Rowridge using a bit of wire stuck in a TV. With a Freeview box it sort of gets BBC2 using a somewhat better bit of wire.
So I say expect disappointment unless you are in a very good reception area.