At my family's cottage in East Wakefield NH, 660 WFAN NYC is audible on the car radio (engine off) almost all day. Maybe in summer you lose it between noon and 3pm. 710 WOR, 770 WABC and 880 WCBS also come in in the morning and late afternoon. I'd say East Wakefield is more than 250 miles from NYC. I've also heard WFAN and WCBS at the Canadian border in the middle of a winter day. WABC wasn't audible due to a daytimer on 760 in Champlain, NY.
At the cottage, 690 CBF/CINF Montreal could also be heard, although they're off the air now. Montreal is about 225 miles away. (730 CKAC from Montreal gets stepped on by 730 Chicopee MA and 800 CJAD Montreal gets stepped on by 800 Lawrence MA.) 810 WGY Schenectady is also heard all day. AM 900 in Sherbrooke, Quebec (a simulcast of 800 CJAD Montreal, was it CKTS?) also used to be heard fairly well by day in East Wakefield, although they are also off the air now. 630 WPRO Providence also comes in by day.