If you have no signal from an external aerial as well as the fitted unit then either there is a short circuit on the cable somewhere or, alternatively, an open circuit so no signal is coming in. Remember that the external aerial has to be connected direct to the TV - it does NOT go through the Status amp box.
Assuming you have the aerial pointing the right way and with the right polarity, you must remember that when you move areas you will have to do a fresh install on the TV - not just a rescan - so that the TV can find everything anew. If you are receiving BBC stations on, say, channel 24 in N Yorks but it is on 59 in Cumbria, then a rescan may find the Cumbria stations but not show them as it will assume them to be additional. If that is the case you will find them at channel 800 or above.
Look through the TV menu system and see if there is a 'Software Reset' option; select that and the TV will then rescan as if it was the first time it had been switched on and should find the Cumbria channels. If there is no reset option then go through the install process but select new scan rather than to search for additional channels or updates.