What does the term LOS communication mean ? Name the types of waves that are used for this communication. Which of the two heights of transmitting antenna and height of receiving antenna can affect the range over which this mode of communication remains effective?

Explanation

### Step-by-Step Solution

1. **Understanding LOS Communication**:
- The term "LOS communication" stands for "Line of Sight communication." This type of communication occurs when the transmitting and receiving antennas are directly visible to each other without any obstruction.

2. **Types of Waves Used**:
- The primary type of waves used in LOS communication are **radio waves**, specifically **space waves**. Space waves travel in straight lines from the transmitting antenna to the receiving antenna, making them suitable for LOS communication.

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