URGENT need of explanation of END FIRE (RADIATION)

I found term, which claim to be a disadvantage of patch antenas.

It's "end fire" radiation or operation.
I have to translate the term into czech, but I don't think that our language has direct word for it, so could anyone please help me to understand the term? I found a few articles, but I don't think that they tried to explain the term.

Zajímavy vyraz :D - ale na1el jsem tohle: end-fire antenna = surface-wave antenna. Dle mého názoru jde jen o to, ?e se vlna 1í?í podel struktury a vyza?uje se a? na konci. Soudím dle antény dielektrické doutníkové - ve vlnovodu je v usti zastrèeno dielektrikum ve tvaru doutníku, a vlna se "dr?í" v dielektrikum a vyza?uje se a? na také právì konci. Tak bych to do èe1tiny p?evedeno vidìl já :D

sorry dear, this is czech language :D

think of a linear array of antennas. "Broadside" radiation is along the normal to the array while "endfire" is parallel to the array. A Yagi-Uda and an LPD are examples of "endfire" arrays. One can often achieve higher gains in "endfire" configurations.

I think that the names are based on a nautical reference to a Man of War with numerous cannons along the gunwales.