According to the FCC attempted communications with any CBRS station located more than 250 kilometers (155.3 miles) away has been eliminated.
67. Power limits and communication distance limitations. When solar conditions permit, it is possible for CBRS stations to communicate over a distance of several hundred miles by sky wave propagation.162 In the NPRM, the Commission suggested that this ability to communicate over long distances has tempted some CBRS users to use directional antennas and illegal linear amplifiers to see how far they can communicate, and it sought comment on whether any technical rules should be amended (such as lower power limits) to prevent such behavior.163 In the alternative, it asked whether there is any harm in allowing CBRS users to communicate in sky wave mode and, if not, whether the current prohibition on communications or attempted communications with any CBRS station located more than 250 kilometers (155.3 miles) away should be eliminated.164 Commenting parties overwhelming oppose lowering the power limit for the CBRS and do not believe sky wave propagation by CBRS operators is a problem.
68. The record does not contain any convincing evidence that the current level of use of sky wave propagation by CBRS operators creates any increase in risk of harmful interference, or presents any other cause for concern. Accordingly, we will retain the current power limit and eliminate the restriction on long-range communications. We will not, as suggested by some commenters, increase the power limit, given the increased potential for interference to other services that would result.166
https://apps.fcc.gov/edocs_public/attachmatch/DOC-344617A1.pdf
67. Power limits and communication distance limitations. When solar conditions permit, it is possible for CBRS stations to communicate over a distance of several hundred miles by sky wave propagation.162 In the NPRM, the Commission suggested that this ability to communicate over long distances has tempted some CBRS users to use directional antennas and illegal linear amplifiers to see how far they can communicate, and it sought comment on whether any technical rules should be amended (such as lower power limits) to prevent such behavior.163 In the alternative, it asked whether there is any harm in allowing CBRS users to communicate in sky wave mode and, if not, whether the current prohibition on communications or attempted communications with any CBRS station located more than 250 kilometers (155.3 miles) away should be eliminated.164 Commenting parties overwhelming oppose lowering the power limit for the CBRS and do not believe sky wave propagation by CBRS operators is a problem.
68. The record does not contain any convincing evidence that the current level of use of sky wave propagation by CBRS operators creates any increase in risk of harmful interference, or presents any other cause for concern. Accordingly, we will retain the current power limit and eliminate the restriction on long-range communications. We will not, as suggested by some commenters, increase the power limit, given the increased potential for interference to other services that would result.166
https://apps.fcc.gov/edocs_public/attachmatch/DOC-344617A1.pdf
