The challenges facing the Church of Ireland by the demand of the Catholic Church that children of mixed marriages are raised as Catholics.

A Protestant Minister, in a semi-rural community in Calry, County Sligo and Elphin County Roscommon, Canon T.P.S. Wood describes the challenges of bringing up children in a mixed marriage.

The Catholic Church demands that children must be brought up as Catholics, thereby alienating Protestants and creating ghetto-like divisions in society. Canon wood argues that the Catholic doctrine forces Protestants closer together.

'Signal: A Builder of Boats and Bridges' was broadcast on 5 December 1969.