More than half of all Oakland Raider games in the last 17 years have been blacked out (59 televised, 72 blacked out), which is partly why they're participating in the new program this year that only requires them to sell 85% of their tickets to avoid a blackout. The catch is any proceeds above that 85% will go more towards the visiting team than usual.
Since 1995, last year is the first year there were no blackouts in Oakland. Not sure how many sponsors had to buy tickets to make that happen, Oakland is the 2nd smallest venue in the NFL at over 63k seats.
Raiders adopt 85 percent threshold for home ticket sales
Chargers the last few years are probably even uglier statistically despite doing much better on the field, didn't see an article at a glance to bring all their stats together.