noun
nationwide broadcast; nationwide hookup
Refers to a broadcast or relay that covers the entire country, often used for TV or radio programs.
そのコンサートは全国中継された。
The concert was broadcast nationwide.
全国中継のニュース番組を見る。
I watch a nationwide news program.
生中継 means 'live broadcast', while 全国中継 emphasizes nationwide coverage, which can be live or recorded.
Compound of 全国 (nationwide) and 中継 (relay, broadcast).