The spaces inside and around the Poljud City Stadium in Split are an ideal opportunity to test wireless network systems of different qualities, characteristics, and generations. The current systems used are the result of many years of development and use several different wireless systems from different manufacturers that together with the signals of nearby buildings and outlets under the stadium stands create an environment full of different signals and a lot of interference. When 30,000 viewers are added to this, with an additional hundred hotspot shares, the 2.4 GHz spectrum becomes almost useless. Devices under the control of the club also transmit at 5 GHz frequency band, but due to the nearby military base and nautical tourism port, radar signals are strong and frequent, thus also greatly interfering with wireless in this part of the spectrum. The aim of this paper is to monitor all transmitters and clients on both spectrums, to simulate measurements in the appropriate tools and to try to find explanations and solutions for the observed effects.