1. RECEVIER
For reception you will need a radio receiver, which can be in the form of a radio station, surveillance receiver or SDR (software defined radio). Of course, an antenna is needed for all these options.
RADIO STATIONS 
SURVEILLANCE RECEIVER 
RTL-SDR
2. DECODER
You have to decode the received sound, we can use a phone or a computer. In the case of a mobile phone, I can recommend the Robot36 application (android) or SSTV Slow Scan TV (iOS). In the case of computers, they recommended the application of MM-SSTV or RXSSTV. It is better to use audio transmission via cable on a computer and via a microphone on a telephone. Download links are listed at the end of the post.
PHONE
ROBOT36 
SSTV Slow Scan TV
COMPUTER
MMSSTV 
RX-SSTV