It is not difficult to protect the digital signal from impulse noise by using well screened components. However a TV Aerial is designed to collect signals, so cannot be screened. What a good aerial does is collect only the good signal and reject the bad signals.
The Log Periodic TV Aerial is ideal for the purpose as it rejects the impulse noise noise by a 15db margin whilst picking up the good TV signal just like a high gain aerial would. We generally will only use these TV Aerials in our installations for obvious reasons.