So basically my friend moved into a new house which had an existing UHF aerial install on the roof.
The coax cable coming from the uhf box was cut . We thought of reconnecting this coax with a joiner from jaycar. Turns out the box inside seems to be connected to a circuit board which is corroded , looks more like a fossil if anything. Does anyone know which part we need to buy  ?

Also the wires coming from the uhf aerial seems to be in bad shape, this would normally be an easy install but i guess age was playing a factor this time.

Pictures below  , thanks.