Audio System
✽ NOTICE
If a non-genuine HID headlamp is installed, the audio system and electronic devices of your vehicle may malfunction.
Antenna

Glass Antenna
When the audio power switch is on and the ignition key is in the ON or ACC position, your vehicle will receive AM and FM signals through the antenna in the rear window glass.
Shark fin antenna
The shark fin antenna receives broadcast signals.
CAUTION
- Do not clean the inside of the rear window glass with cleaner or use a scraper to remove foreign deposits, as this may damage the antenna elements.
- Avoid adding metallic coatings such as Ni, Cd, etc. This may interfere with the reception of AM and FM broadcast signals.
- To avoid damaging the rear glass antenna, never use sharp objects or window cleaners containing abrasives. Clean the inside surface of the rear window with a piece of soft cloth.
- Be careful when attaching a sticker to the inside surface of the rear window so as not to damage the rear glass antenna.
- Do not place sharp objects near the rear glass antenna.
✽ NOTICE
Tinted rear window glass may affect the proper operation of the antenna.
How Radio Reception Works
FM Reception

AM and FM radio signals are broadcast from transmitter towers located around your city. They are intercepted by the vehicle's radio antenna. This signal is then processed by the radio and sent to the vehicle's speakers.
However, in some cases the signal received by your vehicle may be weak and unclear.
This may be caused by factors such as distance from the radio station, proximity to other strong radio stations, or buildings, bridges, or other large obstacles in the area.
Morning Reception

AM radio broadcasts can be received over greater distances than FM broadcasts. This is because AM radio waves are transmitted at low frequencies. These long-distance, low-frequency radio waves can follow the curvature of the Earth rather than travel in a straight line. In addition, they bend around obstacles, which provides better signal coverage.
FM Radio Station

FM broadcasts are transmitted at high frequencies and do not bend to follow the surface of the Earth. Because of this, FM reception usually starts to fade within a short distance from the station. In addition, FM signals are strongly affected by buildings, mountains, and obstacles. This may result in undesirable or unpleasant listening conditions, which may lead you to think there is a problem with your radio. The following conditions are normal and do not indicate a problem with the radio:

- Fading – As your vehicle moves away from the radio station, the signal weakens and the sound begins to fade. In this case, we recommend that you select another station with a stronger signal.
- Static/Multipath: Weak FM signals or large obstacles between the transmitter and your radio may interfere with the signal, causing static or fluttering noise. Reducing the treble level may reduce this effect until the interference clears.

- Station switching: As the FM signal weakens, another, stronger signal near the same frequency may begin to play. This is because your radio is designed to lock onto the clearest signal. In this case, select another station with a stronger signal.
- Multipath cancellation: Receiving radio signals from multiple directions may cause distortion or fluttering. This may be caused by the direct and reflected signals of one station, or by signals from two stations with close frequencies. If this occurs, select another station until the condition clears.
Using a Mobile Phone or Two-Way Radio
When a cellular phone is used inside the vehicle, noise may be heard from the audio system. This does not mean that there is a problem with the audio equipment. In this case, try to keep mobile devices as far from the audio equipment as possible.
When using a communication system such as a cellular phone or two-way radio inside the vehicle, a separate external antenna must be installed. When a cellular phone or radio is used only with the internal antenna, it may interfere with the vehicle's electrical system and adversely affect the safe operation of the vehicle.
WARNING! Using a mobile phone
Do not use a mobile phone while driving. Stop in a safe place to use a mobile phone.
WARNING - Distracted Driving
Driving while distracted can result in loss of vehicle control, resulting in an accident, serious injury or death. The primary responsibility of the driver is the safe and legal operation of a vehicle. Portable devices, other vehicle equipment or systems that take your eyes, attention and concentration away from the safe operation of the vehicle, or that are illegal, must never be used while driving.
Test yourself
A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.