A sandwich structure which attenuates the PET radiation minimally, is used as a support tube for the transmit antenna. When a request from a source is transmitted across the interface to a destination, a filter component in communication with the destination dynamically allows only one or more relevant responses from the destination to transition the interface to the source. A particular wagerable amount may be associated with a multiplier that is predetermined, or randomly selected from a group of predefined multipliers, or selected from a group based on a probability.