For the best results, the wire should have no splices. These are widely used in Scandinavia, and combine equalizers and impedance-reducing transformers with a transmitter remote control system. Beyond the technical issues, there may be legal or bureau-cratic problems installing cables which cross public and private properties. Whoever owns or regulates each property can deny permission or charge fees for letting an STL pass through. But the fees some bureaus charge for STLs are so high that private arrangements between property owners and broadcasters could be cheaper.
Many American stations have STLs that use radio waves instead of long cables.
This is often less expensive than a wire system, and property owners may not even realize that the signal is there. Several radio bands are set aside in the United States for STLs. For clear reception at the transmitter site, there should be an unblocked view from the studio - more precisely, from the STL antenna mounted at a high point near the studio. Radio STLs are not considered broadcasts. That also reduces the power needed to deliver an adequate signal, and lets other broadcasters use these channels on different beam-paths without interfering with each another.