| Air-traffic control aid | 23 |
| Aid in detecting speeders | 25 |
| "MASH" palindrome | 27 |
| Traffic cop's device | 24 |
| Speed-detecting devices | 23 |
| Some highway patrol equipment | 29 |
| Some control tower equipment | 28 |
| Air traffic control devices | 27 |
| Dangers for the over-70 crowd | 29 |
| Choice for a tire buyer | 23 |
| Like the arms of a starfish | 27 |
| Like some saws and tires | 24 |
| 1948 Michelin introduction | 26 |
| Un-biased Lincoln supporter? | 28 |
| Steel-belted auto part | 22 |
| One with biased ancestors? | 26 |
| Units of angular measurement | 28 |
| Angular-measurement units | 25 |
| Alternative to degrees | 22 |
| Spread, as joy or love | 22 |
| Spread out from the center | 26 |
| Moderate's opposite | 23 |
| Extremist's privilege? | 26 |
| They're half the diameter | 29 |
| They meet in the middle | 23 |
| They form central angles | 24 |
| Geometry-class measurements | 27 |
| Projections from a hub | 22 |
| Lines on a pie chart, e.g. | 26 |
| Bicycle spokes, for instance | 28 |
| Wheel spokes, essentially | 25 |
| Two may make a diameter | 23 |
| They're found in circles | 28 |
| They start in the middle | 24 |
| They meet at the center | 23 |
| They go straight in a circle | 28 |
| They come from the center | 25 |
| Pizza slice borders, e.g. | 25 |
| Pizza cuts, essentially | 23 |
| Pie cuts, geometrically | 23 |
| Minute hands, in a way | 22 |
| Minute hands, essentially | 25 |
| Many lines on pie charts | 24 |
| Lines on sonar screens | 22 |
| Cuts into a pizza, often | 24 |
| Cuts into a pie, often | 22 |
| Bike spokes, essentially | 24 |
| Marconi's interest | 22 |
| You may walk with it, man | 25 |
| The "R" of NPR | 24 |
| Pre-television entertainment | 28 |
| Marconi's invention | 23 |
| Fred Allen's medium | 23 |
| Fireside chat requirement | 25 |
| Beachgoer's take-along | 26 |
| "Satellite" service | 29 |
| You may find a ham on one | 25 |
| Word after clock or talk | 24 |
| Where Kaltenborn held forth | 27 |
| Uncle Don's medium | 22 |
| The "R" of N.P.R. | 27 |
| The "R" in RCA | 24 |
| Ted Husing's medium | 23 |
| Super Troupers' medium | 26 |
| Speech carrier, in a way | 24 |
| Slice of a media ad budget | 26 |
| Shock jock's milieu | 23 |
| Pilot's communicator | 24 |
| Paul Harvey's medium | 24 |
| Message receiver and sender | 27 |
| Medium of communication | 23 |
| Medium for some jockeys | 23 |
| Ma Perkins's medium | 23 |
| Lowell Thomas's milieu | 26 |
| Lee DeForest's medium | 25 |
| It has bands with music | 23 |
| Howard Stern's medium | 25 |
| Gildersleeve's medium | 25 |
| Fibber McGee's medium | 25 |
| Depression-era cathedral | 24 |
| Charlie McCarthy's medium | 29 |
| Certain kind of activity | 24 |
| Benny's early medium | 24 |
| Amplifier, antenna, etc. | 24 |
| Allen's ____ Days | 24 |
| Advertiser's choice | 23 |
| "The Shadow" medium | 29 |
| "Easy Aces" medium | 28 |
| 'Car Talk' medium | 25 |
| Time of much listening | 22 |
| Time before television | 22 |
| Late 1920s to around 1950 | 25 |
| Contact headquarters, perhaps | 29 |
| Aircraft navigation system | 26 |
| They're all set to play | 27 |
| Communicates, in a way | 22 |
| You want your songs on them | 27 |
| Contacts ship-to-ship, maybe | 28 |
| Communicates à la sparks | 27 |
| Calls for help, perhaps | 23 |