6.719" overall length 4.625" overall width 20 single mounting facility thread quantity per inch tap, circuit selector unc single mounting facility thread series
2b single mounting facility thread class 4.375" overall length 2.000" overall width 32 single mounting facility thread quantity per inch tap, square frame unc single mounting facility thread series
Used on general applications electronics (gen-ap-e). rtn equipment antenna group model RTA2, CB13031, pg 10-9, 6780.1/6820.6//fa 6236, cb 13031, pg 4 of rtn-2 antenna unf thread series