The use of air horns at the ballpark can be traced back to Hilda Chester who popularized the idea of fans making themselves heard. During the 1930's when she would attend games at Ebbets Field with a frying pan and an iron ladle. The frying pan was soon replaced by her trademark brass cowbell. The idea quickly took hold throughout the USA and while the cowbell continues to enjoy regional popularity, popular culture has chosen the loud blast of an sounder as its successor. Modern day sounders often are adjustable up to 120db that when combined with the acoustics of a basketball or baseball stadium can be clearly heard on the field, in the dugouts, and in the broadcast booth. Here are the best canister available on the net.

MOTORCYCLE AIR HORN Stebel Nautilus Black + FREE Shipping UTV ATV Power Sports
MOTORCYCLE AIR HORN Stebel Nautilus Black + FREE Shipping UTV ATV Power Sports
$29.99
Time Remaining: 20d 3h 46m
Buy It Now for only: $29.99

MOTORCYCLE AIR HORN Stebel Nautilus Chrome + FREE Shipping UTV ATV Power Sports
MOTORCYCLE AIR HORN Stebel Nautilus Chrome + FREE Shipping UTV ATV Power Sports
$49.99
Time Remaining: 22d 3h 13m
Buy It Now for only: $49.99

GET 2 air horn Portable hand held security safety Party Sports LOUD BLAST81OZ
GET 2 air horn Portable hand held security safety Party Sports LOUD BLAST81OZ
$7.18
Time Remaining: 29d 4h 41m
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Air Horn Super LOUD Hand Held Gas Sports Races Boat Marine Warning Coyote Scare
Air Horn Super LOUD Hand Held Gas Sports Races Boat Marine Warning Coyote Scare
$7.29
Time Remaining: 11d 5h 11m
Buy It Now for only: $7.29

PORTABLE AIR HORN SPORTS BOATING RACES DEAFENING LOUD FREE FAST S H
PORTABLE AIR HORN SPORTS BOATING RACES DEAFENING LOUD FREE FAST S H
$4.24
Time Remaining: 17d 5h 18m
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2 X Air Horn Portable security safety Party Sports Boat LOUD BLAST 81OZ FREE SH
2 X Air Horn Portable security safety Party Sports Boat LOUD BLAST 81OZ FREE SH
$6.79
Time Remaining: 3d 22h 44m
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2 air horn Portable hand held security safety Party Sports boat LOUD BLAST 81OZ
2 air horn Portable hand held security safety Party Sports boat LOUD BLAST 81OZ
$6.99
Time Remaining: 20d 4h 19m
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Safty Sports MARINE SPORT EVENTS AIR HORN BOAT SAFETY SL52418
Safty Sports MARINE SPORT EVENTS AIR HORN BOAT SAFETY SL52418
$6.50
Time Remaining: 15d 21h 58m
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BOAT MARINE Safety Sports HAND HELD AIR HORN Small 35oz up to Mile range USCG
BOAT MARINE Safety Sports HAND HELD AIR HORN Small 35oz up to Mile range USCG
$14.95
Time Remaining: 22d 7h 51m
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Of course you could always build your own Air Horn...

You will need:

1 - 35 mm film canister

a plastic grocery bag, scissors

5/8" drill bit

3/8" drill bit

3/4" drill bit

a drill

Take the empty plastic 35 mm film canister and cut a 5/8 inch hole in the bottom of the canister and a 3/8 inch hole in the side of the can near the bottom.

Cut a 3/4 inch hole in the lid of the canister. Cover the mouth of the canister with a thin plastic sheet cut from a plastic grocery bag and pop the lid on over it. The plastic sheet now forms a membrane.

Push a length of 5/8" O.D. PVC pipe into it the hole in the bottom of the canister and slide it in until the end of it rests against the membrane. When you blow through the hole in the side of the canister it will give out a tremendously loud tone.

With a little adjustment of the position of the tube, the pressure of the blown into the hole will lift the plastic membrane off the end of the pipe momentarily allowing the air to escape. The tension of the membrane causes it to flap back and the process repeats rapidly causing the noise.