How many letters does the top answer for “responding to or operating at a wide band of frequencies” have?

The most common answer is broadband (9 letters).

Crossword clue: responding to or operating at a wide band of frequencies

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

broadband 9 letters wn-def

responding to or operating at a wide band of frequencies

wideband 8 letters wn-def

responding to or operating at a wide band of frequencies