The Pokertronic web site says that the maximum 'range' of the signal is about 4 inches or 10 centimeters. That is fine, except it doesn't say anything about signal security between the antennas in the table and whatever receives that signal, it may be wireless or wired, but it could be a problem that isn't addressed.
I do see these were used last year in the EPT, but personally I am not convinced with what I have seen and read.