2-29. The   most   distinct   advantage   of 2-23. When   would   a   counterpoise   be used? 1. When   easy   access   to   the antenna   base   is   necessary 2. When   the   surface   below   is solid   rock 3. When   the   surface   below   is sandy    ground 4. All   the   above 2-24. Capacitive     top-loading     helps to   increase   which   of   the following    antenna characteristics? 1. Bandwidth 2. Power-handling 3. Directivity 4. Radiation     efficiency 2-25. What   is   the   most   limiting characteristic   of   the   Yagi antenna? 1. Power-handling 2. Narrow    bandwidth 3. Physical    size 4. Lack    of    directivity 2-26. In    general,    log-periodic antennas   have   which   of   the following characteristics? 1. Medium    power    handling capabilities 2. High   gain 3. Extremely    broad    bandwidth 4. All   the   above 2-27. A   typical   vertical   monopole log    periodic    antenna    designed to   cover   a   frequency   range   of 2  to  30  MHz  will  require approximately   how   many   acres of   land   for   its   ground   plane system? 1. 1  acre 2. 2  acres 3. 3  acres 4. 4  acres 2-28. A   sector   log–periodic   array can  act  as  an  antenna  for  a minimum   of   what   number   of transmit   or   receive   systems? 1. 1 2. 2 3. 3 4. 4 2-30. 2–31. 2-32. 2-33. 2-34. the    rotatable    log–periodic antenna   is   its   ability   to perform    what    function? 1. Rotate   360   degrees 2. Rotate   from   horizontal   to vertical   and   back 3. Ability   to   handle   high transmitter    power 4. Ability   to   produce   high antenna    gain What   is   the   average   power handling   capability   of   an Inverted    Cone    antenna? 1. 20  kw 2. 30  kw 3. 40  kw 4. 50  kw What   determines   the   gain   and directivity   of   a   Rhombic antenna? 1. Transmitter    power 2. Antenna     height 3. Radiated    wave    interaction 4. Transmitted     frequency Most   Whip   antennas   require some   kind   of   a   tuning   system to   improve   bandwidth   and   power handling    capabilities. 1. T 2. F Why   are   UHF   and   VHF   antennas on   board   ship   installed   as high   as   possible? 1. To    prevent    radiation hazard   to   personnel 2. To    prevent    radiation hazard   to   ordinance 3. To   increase   power handling    capabilities 4. To    prevent    unwanted directivity   in   the radiation    pattern    from mast     structures The   central   feed   section   for both   the   biconical   and   center- fed   dipole   are   protected   by what   type   of   covering? 1. SCOTCHCOAT 2. RTV 3. Laminated    fiberglass 4. Rubber    shield 8