Quantic PMI Model PIM-333M368M-28-816-5V-SFF Variable Frequency Comb Generator with an input frequency from 333 to 368 MHz and 2.0 to 16.0 GHz output. It has a maximum VSWR of 1.8:1, an input tone range power level of -17 dBm ± 3 dB, and an input tone spurious rejection of -55 dBc. This unit's housing is 4.50" x 3.50" x 0.75" and has SMA female connectors.  https://www.pmi-rf.com/product-details/pim-333m368m-28-816-5v-sff