According to the Shannon capacity theorem, the large bandwidths that are available in the millimeter wave (mmWave) frequency bands enable high-throughput wireless communication. Indoor applications include high-throughput access points for video streaming, gaming, and virtual and augmented reality, as well as wireless hubs and board-to-board interconnections in server rooms. Outdoors, cellular systems benefit from the increased bandwidth, for example, in fifth-generation (5G) and future sixth-generation mobile networks. Another application for outdoor wireless communication at mmWave frequencies is fixed wireless access (FWA), in which fixed point-to-point wireless links provide internet connectivity to residential and enterprise buildings. FWA can be a cheaper alternative than deploying a fiber-optic network, as no digging is required and the infrastructure work is limited (Ioannou et al., 2020).Reliable wireless channel models are critical for the design of wireless systems. Numerous indoor radio channel models at 60 GHz exist, and an overview of indoor mmWave channel models is provided in Al-Saman et al. (2021). Indoor channel measurements at 60 GHz for wireless local area network (WLAN) applications are presented in Moraitis and Constantinou (2004), and the IEEE Std. 802.11ad wireless standard is designed for communication at 60 GHz, using channels with a bandwidth of 2.16 GHz (IEEE 802.11ad, 2012). In Zhou et al. ( 2017), good agreement is found between indoor measurements and ray-tracing simulations using geometrical optics and the uniform theory of diffraction. A statistical spatio-temporal model for large indoor environments shows that Line-of-Sight (LOS) paths and specular reflections are dominant over diffuse scattering (Haneda et al., 2015). Channel measurements at 60 GHz in an office environment are presented in de Jong et al. (2018), Dupleich et al. (2014), Maltsev et al. (2009), and Wu et al. (2017. A 60 GHz conference room channel model is provided in Maltsev et al. (2010). In He et al. (2018), a train environment is considered, and channel models for a data center environment are presented in Gentile et al. (2018) andZaaimia et al. (2016). In a hospital environment, lower path loss (PL) and delay spread values are found, compared to other indoor environments (Kyrö et al., 2011). The influence of human activity on the 60 GHz indoor radio channel is discussed in Collonge et al. (2004), and a human blockage model is provided in Jacob et al. (2011Jacob et al. ( , 2013. Indoor reflection and transmission measurements at various mmWave frequency bands are presented in Xing et al. (2019). Penetration loss measurements at 73 GHz are presented in Ryan et al. (2017). Reflection and transmission measurements of interior structures of office buildings are presented in Sato et al. (1997). Penetration and reflection loss measurements at frequencies 60, 71, and 81 GHz are studied in Khatun et al. (2021). The estimation of material characteristics at 60 GHz from
