Cnoc an Oir is the highest point in North Kerry and as such it has large masts which carry TV, radio etc...
There is also alot of history associated with Cnoc an Oir.
It is reputed that Diarmuid Ua Duibhne and the beautiful princess Gráinne eloped and made their way to the top of Cnoc an Oir so they could keep an eye out for the Fianna who were in pursuit.
The story begins with the aging Fionn mac Cumhaill, leader of the warrior band the Fianna, grieving over the death of his wife Maigneis. His men find that Gráinne, the daughter of High King Cormac mac Airt, is the worthiest of all women and arrangements are made for their wedding.
At their betrothal feast, however, Gráinne is distressed that Fionn is older than her father, and becomes enamored with Fionn's handsome warrior Diarmuid .
She slips a sleeping potion to the rest of the guests and encourages Diarmuid to run away with her. He refuses at first out of loyalty to Fionn, but relents when she threatens him with a geis (curse) forcing him to comply.
They hide in a forest across the River Shannon, and Fionn immediately pursues them. They evade him several times with the help of other Fianna members and Aengus Óg, Diarmuid's foster father, who conceals Gráinne in his cloak of invisibility while Diarmuid leaps over the pursuers' heads.