An Bord Pleanala has refused permission for a 39 metre high mast in Rossmore Park.
Cignal Infrastructre had been seeking permission for the mobile and broadband tower in the Monaghan town forest park, saying the area was identified as a coverage blackspot.
Monaghan County Council refused permission last year, with the applicant appealing this decision to An Bord Pleanala.
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Having considered the appeal and observations from those opposed to the development, the planning authority refused permission, saying it would be "a permanent, intrusive man-made structure in the skyline".
The inspector ruled that the mast would have "moderate to significant" landscape and visual impacts on Rossmore Park and surrounding areas if approved.
