The evaluation kit contains a dwm1001 module which is already designed to work within electrical and rf standards. It is not necessary to redesign the antenna. UWB technology can work in different channels, according to the channel used are the characteristics you will get. For long range you take slow channels (they are not normally used to locate, only for iot messages). To locate it is common to use fast channels, normally channel 5 that operates at 6.8 Mbps. In general, uwb usually has little interference when being in a high and exclusive band at the moment.
The visibility of the anchors and tags depends entirely on the environment (walls, glass, racks and any type of obstacle) and the topology you choose. In general the coverage radius per anchor is 40 meters but in practice it is usually smaller. In the case of Raspberry, only Gateway is used, which collects all the information of the anchors and tags by sending mqtt for further processing.
The dwm1001 module has a low-power ble processor with which in addition to performing the location you can mount your own application to perform additional tasks to the location.