An antenna converts electromagnetic fields into electron oscillations(currents) or vice versa.

Dishes on roof tops are called parabolic reflectors that collect electromagnetic energy and focus on to the receiver more than ordinary dipole antenna

Doppler Radar is the arrangement that determines velocity and direction of an aircraft.

Remote controls of TV, AC and other home appliances transmit energy in infrared spectrum.

Electromagnetic pulse (EMP) is the electromagnetics version of a nuclear bomb with similar mass destruction capabilities.

IEEE 802.11(wireless LAN) and microwave oven operate the same frequency of 2.45GHz.Interference issue commented in 2mrw's post.

A mobile ad hoc network (MANET) is a sef-configuring network of mobile devices connected by wireless links.More on this in 2mrw's post.

In India, GSM is operated in 2 bands namely GSM 900(operating at 900MHz) and GSM 1800(operating at 1800MHz).

Frequency and size of antenna are inversely related. Hence cell phone antennas are compact in size due to their high frequency operation(order of MHz).

Shortwave(SW1 & SW2) stations on ur old radio set tune the receiver to receive radio waves reflected by ionosphere. This is called skywave propogation.

Uplink freq is the freq band over wich u send the signal and downlink freq is the freq band over wich u receive. Think y they can't be kept the same.

Direct To Home(DTH) television broadcasting via satellite falls under Ku band of microwave region. 11.7-12.7GHz(uplink), 14-14.5GHz(downlink)

GSM stands for Groupe special Mobile. CDMA stands for Code Division Multiple Access.

Wireless cellular signal booster is an antenna setup which can b used to enhance the signal reception of a cell phone.