CREATE TABLE table_13998897_1 (height_m___ft__ VARCHAR, frequency_mhz VARCHAR)

how many height m ( ft ) with frequency mhz being 100.1
SELECT COUNT(height_m___ft__) FROM table_13998897_1 WHERE frequency_mhz = "100.1"
SELECT COUNT("height_m___ft__") FROM "table_13998897_1" WHERE "100.1" = "frequency_mhz"