Oldtyme,
The Airtronics receivers are just like the Futaba receivers. They have the receivers with two short antenna leads coming out of them.

Here are 4 of the 6 current Airtronics receivers. From top to bottom are the 10 channel, 8 channel, 7 channel, and the 6 channel park flyer receiver. Not shown are the 6 channel full range and the 5 channel full range. The second picture shows you the size of the 10 channel receiver, you can judge the size of rest from that one.

Ken