Depending on the RF module that is chosen, there may not be anything else that is required by the design. If the module does not come with an antenna, then this is the next major consideration. Whether it is an external whip antenna or an embedded loop antenna, its placement in the product should be considered up front. TE Connectivity Linx has a broad line of antennas designed with portable products in mind. A connector may be needed if the antenna is removable. This leads to another legal consideration which is that the FCC requires a non-standard, permanent, or proprietary connector on an antenna. Standard types like SMA, BNC, or N are illegal in the United States. Reverse polarity or reverse thread connectors meet the FCC’s non-standard requirement. TE Connectivity Linx has a full line of reverse polarity connectors in many styles to meet the needs of most applications.