As Jed has said we are now going radio silent. Many of the highest power shortwave stations such as Deutsche Wella have gone off of the air. They have been replaced with very lower power cellphone like gigahertz transmitters from local and satellite transmitters. In PA I pick up only one local television station now as compared with 4 regional stations with the old VHF system, UHF does not defract downward as VHF does. Television may someday go to low power and cable only with the effectiveness of high power UHF digital air wave transmission being limited.
Radar my go as all planes are equipped with transponders. It was proposed by someone, I forget who, that we make a circle of fire on the earth to signal Mars. Tessla tried to signal Mars with his coil, what a waist, we now know Mars is dead. Antigravity is coming someday, as all of the magnetic fields, including the gravitomagnetic, are not a conserved property of the universe. There is nothing fundamental stopping us just the know how. Maybe that will get us out there. Someone should do a story of this all with the 100 anniversary of the beeping transmitter and send it to IE. Frank Radio transmissions might be an ancient form of communications to an advanced civilization. It could be like us talking to each other with smoke signals.
