Peter Harte, Omagh's only survivor from the 2007 MacRory Cup triumph, blasted home a superb 12th minute goal, hitting the roof of Niall Morgan's net to cap a flowing move involving Brian McGarvey, Declan Connoly and Ronan O'Neill.
Wing-back Stephen McCrory, Harte and Hicks had already floated over points to establish CBS supremacy, with Dungannon failing to build on an early Kiefer Morgan point.
Omagh opened up a seven points lead, thanks to some superb points from Harte and Colm Hicks, but McKenna, who had been drifting between midfield and full forward, collected a long delivery from Dermot Thornton to finish superbly to the net, placing his shot inside the far post with immaculate precision.
After dominating the opening half-hour, Omagh went in at the break with a flimsy three points lead, 1-6 to 1-3.
Dungannon started the second half with purpose, and when McKenna was fouled by Stephen Mullan as he bore down on goal, Thornton drilled home the 39th minute penalty to give them the lead.
Ciaran Gervin's strong running was now causing immense problems for a hard-pressed Omagh defence and he floated over two scores to press home the advantage.
But Harte did convert a free to narrow the gap to just two points with four minutes to play, before Conan Grugan left just a point between the sides.
But time ran out for the2007 winners, and the reigning champions were crowned again
SCORERS - Dungannon: D Thornton 1-1 (1-0 pen), N Mckenna 1-0, K Morgan 0-3 (1f) C Gervin 0-2, L Gervin 0-1. Omagh: P Harte 1-4 (1f), R Lynch 0-2, C Grugan, C Hicks, S McCrory 0-1 each.
Dungannon: N Morgan, P Muldoon, B Kelly, J Grimley, S McGarrity, G Teague, D Toner, D Lavery, J Loughran, S Small, C Gervin, L Gervin, K Morgan, N McKenna, D Thornton. Sub: D Quinn for McGarrity
Omagh: R McAnenly, D Connolly, S Warnock, F McQuaid, S McCrory, A O'Donnell, S Mullan, C Grugan, S Harper, P Harte, R O'Neill, B McGarvey, J Donnelly, C Hicks, R Lynch. Subs: K McCullagh for Donnelly, T Canavan for Harper
Referee: J White (Donegal).
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