This paper addresses aspects of design for WiMAX wireless networks to establish a point-to-point, PTP, link with Alvarion BreezeNET B equipment, from the Health Sciences Faculty of University of Beira Interior to Hospital Amato Lusitano (in Castelo Branco, Portugal), and also presents the respective field trial with pre-WiMAX PTP equipment. The design of the link with relays had into consideration the carrier to noise ratio, and the minimum carrier to noise ratio with fading. Field trials results agree with the ones extracted from the dimensioning process. The small differences registered can be explained by the small beam width of the antennas and therefore to imperfect orientation during the field trials. The actual installation of the three hop link was successfully achieved, followed by a tune up of the tilt of the antennas, by the choice of the best QoS parameters and of the turbo-mode for the equipment, which allowed for obtaining higher values of the throughput.