Abstract: A feed transport device for moving a feed within a non-planar focal surface defined by a satellite communications antenna, comprises first and second non-linear rails, and a feed transport unit comprising a feed support member for supporting the feed, and first and second slidable members slidably mounted on said first and second rails respectively to permit each slidable member to slide along the length of its respective rail, wherein one end of the feed support member is pivotally attached, not necessarily about a single pivot axis, to the first slidable member, the other end of the feed support member is both slidably and pivotally, again not necessarily about a single axis, attached to the second slidable member, and the first and second rails are shaped and positioned to maintain the feed in, or near to, said focal plane during movement of the feed support member along the first and second rails.