antenna

battleship

broadcast

cellular

crane

dark

day

dock

energy

equipment

exploration

frequency

heavy

industry

machine

marine

mast

military

museum

naval

navy

port

power

radar

radio

receiver

satellite

sea

ship

signal

silhouette

sky

station

steel

sunrise

sunset

tall

technology

telecommunication

telephone

television

tourists

tower

transmit

transmitter

transportation

vehicle

vessel

warship

water