By Chris Codella, W2PA
April 10, 2009
This month's title hints at the puzzle's hidden sub-theme (especially when taken together with last month's theme).

Across
1. New year's eve party
4. 32-down companion
10. Yagi, for one
14. What a keeper may keep
15. Throat ornaments
16. 1960s kit maker
17. Roman WARC band?
18. Demodulate
19. Horn sound
20. Top report, for short
21. Bigger than mins.
22. Coke flavor source
24. Superman player
26. Alternate G-land prefix
27. 86, 87 and 89 source
28. VU place
31. Pilot's prediction
33. ___ jacket
36. Venetian royal
38. 10m does it, with spots
42. This puzzle's subtheme
45. Uruguay prefix
46. Unpopular spots
47. Final (amp) resting place?
48. Elephant grp.
50. "Oh no!"
52. Sporadic E band
55. Zero
57. ARES's cousin
61. With anger
63. Bygone airline
65. Average name
66. Audio characteristics
67. Chicken
69. PQ leaders
70. "No ifs, ___ ..."
71. Epic name for SV folks
72. Gray
73. What crank-up sections do
74. 25-down variety
75. Gate type
Down
1. Benton Harbor lunchbox
2. Pet prefix?
3. Possible Indy prefix
4. Toledo team member
5. Say K
6. Grass shacks
7. Draft pick
8. Nutcase
9. Chemical class
10. Kind of test
11. Irish prefix
12. Inverter label
13. "Of, by and for the radio amateur", e.g.
23. Allow to be known
25. Leif Ericson's rig?
26. Like the Mystery Tour
29. Drill wielder: Abbr.
30. Zero place
32. Cochise's rig?
33. Eastern contest club
34. W6 airport
35. Brouhaha
37. IT9 erupter
39. W1 sect.
40. Batt. term.
41. ZP dir. from W2
43. Austrian prefix
44. Part of H.M.S.
49. Deep space object
51. Professor's aide
52. Big rig?
53. Moldovan prefix
54. Not 70-across
56. Spandex brand
58. Madison Avenue worker
59. 9Q-land
60. Benton Harbor lunchbox
62. Radiosport, for short
63. Math subj.
64. "Houston, ___ had a problem"
68. "?"
© Copyright ARRL 2009